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OpenStudy (anonymous):
Use basic identities and algebra to simplify the expression. Assume all denominators are nonzero. (sin t - cost t)^2
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myininaya (myininaya):
(sint-cost)(sint-cost)=(sint)^2-2sintcost+(cost)^2
myininaya (myininaya):
but (sint)^2+(cost)^2=1
myininaya (myininaya):
1-2sintcost
myininaya (myininaya):
=1-sin(2x)
OpenStudy (anonymous):
how did you get the last step?
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