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  1. A

    Cambridge Prelim MX1 Textbook Marathon/Q&A

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread Do I need to use product rule?? I tried using the chain rule and it is a big mess and getting me nowhere.
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    Cambridge Prelim MX1 Textbook Marathon/Q&A

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread How do you get from the 2nd last line to the last line??
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    Cambridge Prelim MX1 Textbook Marathon/Q&A

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread I got it.
  4. A

    Cambridge Prelim MX1 Textbook Marathon/Q&A

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread I have converted everything to radians. Do I then add the fractions??
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    Cambridge Prelim MX1 Textbook Marathon/Q&A

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread So we know x degree is xpi/180 rad Hence find: Derivative of (tan (x degrees + 45 degrees))
  7. A

    Cambridge Prelim MX1 Textbook Marathon/Q&A

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread what is the derivative of cos^5 3x .
  8. A

    Cambridge Prelim MX1 Textbook Marathon/Q&A

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread How do you find the derivative of y = log base e ( cosx)
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    Cambridge Prelim MX1 Textbook Marathon/Q&A

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread Use the expansion of cos(A+ B) and cos(A-B) to prove that cosS - cosT = -2sin1/2 (S + T)sin1/2 (S -T)
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    Cambridge Prelim MX1 Textbook Marathon/Q&A

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread Given the parametric equations x = e^t cost , y = e^t sint, show that dy/dx = tan ( t + pi/4 ) .
  11. A

    Cambridge Prelim MX1 Textbook Marathon/Q&A

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread Find dy/dx in terms of x and y by differentiating implicitly: sin x + cos y = 1
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    Cambridge Prelim MX1 Textbook Marathon/Q&A

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread what is lim E -> 0 of E^2 / cos^2 E The answer says 0. Why is that?? And not 1 ??
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    Related Text for Robert Frost Poetry?

    Which related text works really well with robert frost poetry? Which one will allow me to compare and contrast? Also it must be able to sustain a sophisticated analysis, so can't have a too simple meaning of discovery?? Thanks for helping me choose. Cheers.
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    Cambridge Prelim MX1 Textbook Marathon/Q&A

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread So the question says Find the acute angle and the obtuse angle between the lines: 2x - y + 1 = 0 and 11x - ( 8 + 5squaroot3)y + 5sqrt3 = 0 So I get Thetha = 30 and that is obviously the acute angle Now finding the obtuse...
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    Cambridge Prelim MX1 Textbook Marathon/Q&A

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread Find the value of tan 135 degrees doing tan( 90 + 45 ) gives me the answer 1 but doing tan ( 180 - 45) gives the answer - 1 The correct answer is -1. Can't find my mistake in the first method. Are both method's valid??
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    Cambridge Prelim MX1 Textbook Marathon/Q&A

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread Unsure about which trig identity you refer to. The answer at the back says 1 - 3^1/2 /2(2)^1/2
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    Cambridge Prelim MX1 Textbook Marathon/Q&A

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread Sorry, wrote the question wrong. Meant to be, find the exact value of sin13pi/12
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    Cambridge Prelim MX1 Textbook Marathon/Q&A

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread Find the exact value of sin2x.
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    Cambridge Prelim MX1 Textbook Marathon/Q&A

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread IF sin A = 2/3 , pi/2 < A < pi , and tan B = 2/3 , pi< B < 3pi/2 , show that cos(A + B) = 3(5)^1/2 + 4 / 3(13)^1/2 Instead of root 13 in the denominator, I got the exact same answer except for root 5 in the denominator...
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    Cambridge Prelim MX1 Textbook Marathon/Q&A

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread If sinx = 3/4 and pi/2 < x < pi , find the exact value of sin2x.
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    Cambridge Prelim MX1 Textbook Marathon/Q&A

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread Now how do I find a positive integer value of n such that sinx = x/n has 69 positive solutions.
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