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Show that d/dx((cosx+sinx)/(cosx-sinx))=sec^2((pi/4)+x). I can't write the pi symbol on here so I just wrote the word. Can anyone solve this? Thanks in advance

Yea I got it using chain rule Thanks

Differentiate sqrt(cosec(x^2)). With working out Thanks in advance

Also how do I simplify this: (25^n-5^n)/(5^(2n-1)-5^(n-1))

Show that cos(x+y)cos(x-y)=cos^2(x)-sin^2(y) Thanks in advance

Thanks but the answers in the book says it's 2sqrt5/5? So is the book's answer wrong?

Not sure what u mean by minimise the d

How do I find the smallest distance between the graphs of y=x^2-4x+12 and y=2x+1?

Thankyou so much

Hey Polynomial question Given that two of the roots of x^4+3x^3-7x^2-27x-18=0 have the same modulus but different signs, solve the equation. (hint- let two of the roots be (alpha) and -(alpha) and use the technique of equating coefficients.) I am stuck on solving these type of questions...

Thanks Oh sorry I will move it to the 3 unit thread

Hey How do you solve x^4-2x^2+1=0? Thanks in advance (:

Ok thanks but the answer in the book is m= sqrt(2)-2/2

I did but I keep getting the wrong answer

Can anyone help me with this question? Find the gradient of the tangent on the curve y=x/sqrt (2x) at the point (4, sqrt(2)). Express your answer as a rational number. Thanks in advance (:

Can anyone help me solve this? Prove that ab<= (1/2(a+b))^2 Hence, prove that abcd<=(1/4(a+b+c+d))^4 <= is less than or equal to Thanks guys

hi can you email me your economics, english adv and ext 1 resources to my email? my email is wgy182@gmail.com thankyou very much.

hey jayson, your marks are just amazing :) About how many hours do you study after school each day and the weekends? do you play any sports and other activities in yr 11 and 12?

Thanks Kingportable, did u work in year 11 and 12?

haha cool! :)