how do I evaluate cos^2 (95 degrees)
I was assigned a math packet for an engineering class and I'm supposed to show work on all problems. Is there any handwritten way to solve this?
4 Answers By Expert Tutors
Another way is to use the trigonometric identity
cos2x = (1/2)[1 + cos(2x)]
cos2(95) = (1/2)[1 + cos(2*95)] = (1/2)(1 - 0.98480775) = 0.007596125
Engineering! First, find cos (95o) = -0.0871557, to 7 DP
Second, square that number. Answer:0. 007596
cos2(95) = cos(95) * cos(95) = (-0.08716) * (-0.08716) = 0.007596
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