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OpenStudy (anonymous):

find F(pi/2) if F(X)=3cos(3x) and i get -3/2 , am i correct???

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|

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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