Quote:
Originally Posted by gretchen  If [theta] is an acute angle with sin[theta]=3/5, find the exact value of cos2[theta].
This is the last one I am stumped on. | Call theta = t for simplicity.
cos^2(t) = 1 - 2*sin^2(t) = 1 - 2*(3/5)^2 = 1 - 2*9/25
= 1 - 18/25 = 7/25
-Dan
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