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Find the coordinates of the points of in...

Find the coordinates of the points of intersection of the curves `y=cosx , y=sin3x if-pi/2lt=xlt=pi/2`

A

`(pi/4, 1/sqrt(2))`

B

`(pi/8, cos p (pi)/8)`

C

`(-(3pi)/8, cos (3pi)/8)`

D

`((3pi)/8, cos (3pi)/8)`

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A, B, C
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