Homework Help: calculus/Trig

Posted by John on Sunday, May 23, 2010 at 4:01am.

Suppose you wish to express sin(3t) in terms of sint and cost. Apply the sum formula to sin(3t) = sin(t+2t) to obtain an expression that contains sin(2t)=sin(t+t) and cos(2t)=cos(t+t). Apply the sum formulas to those two expressions. Enter the resulting expression for sin(3t) here:____

calculus/Trig - drwls, Sunday, May 23, 2010 at 6:50am
sin(3t) = sin(2t)cos t + sint cos(2t)
= [2sint*cos^2t + sint(cos^2t - sin^2t)
= 3sint*cos^2t -sin^3t
You can get rid of the cosine function.
= 3sint(1 - sin^2t)- sin^3t
= 3sint -4 sin^3t

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