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OpenStudy (anonymous):
if f(x) = cos2x, find f(3pi/4)
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OpenStudy (anonymous):
0?
OpenStudy (anonymous):
f(3/4pi) = cos(3/2Pi) =0
OpenStudy (anonymous):
yes, but how did you figure it out?
OpenStudy (anonymous):
if f(x)=cos(2x) then f(3/4pi) = cos (2*3/4pi) = cos ((3/2pi) But 3/2Pi = 270 degrees ( where Pi = 180) cos (270) = 0
OpenStudy (anonymous):
ohhh okay. thanks. :)
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OpenStudy (anonymous):
vw
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