ToO LaZy ^*
n/a
i've suddenly forgotten how to do these..
express
sinx - cosx in the form Asin(x - @) with A > 0 and 0 < @ < pi/2
express
sinx - cosx in the form Asin(x - @) with A > 0 and 0 < @ < pi/2
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quiky (1 Viewer)
- Thread starter ToO LaZy ^*
- Start date
* Expand Asin(x - @) using double angle formulae
* Equate coefficients of sin x and cos x to get two simultaneous equations in the two unknowns A and @
* (1)<sup>2</sup> + (2)<sup>2</sup> should give the value of A<sup>2</sup>, from which you can find that A = sqrt(2)
* (1) / (2) should give the value of tan @
* Equate coefficients of sin x and cos x to get two simultaneous equations in the two unknowns A and @
* (1)<sup>2</sup> + (2)<sup>2</sup> should give the value of A<sup>2</sup>, from which you can find that A = sqrt(2)
* (1) / (2) should give the value of tan @
ToO LaZy ^*
n/a
problem in process...
ToO LaZy ^*
n/a
done!..
cheers!
cheers!