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OpenStudy (anonymous):
find F(pi/2) if F(X)=3cos(3x) and i get -3/2 , am i correct???
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ganeshie8 (ganeshie8):
F(pi/2) = 3cos(3pi/2)
ganeshie8 (ganeshie8):
whats the value of cos(3pi/2) ?
OpenStudy (anonymous):
-1/2?
ganeshie8 (ganeshie8):
think again, u familiar wid unit circle ?
ganeshie8 (ganeshie8):
|dw:1394861384531:dw|
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ganeshie8 (ganeshie8):
cos(3pi/2) = 0
ganeshie8 (ganeshie8):
F(pi/2) = 3cos(3pi/2) = 3*0 = 0
OpenStudy (anonymous):
ohhhhh yeaaa ur right , so the answer is 0 ?
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