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If `sin2theta=cos3theta` and `theta` is an acute angle , then `sintheta` is equal to

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If `sin2theta=cos3theta` and `theta` is an acute angle , then `sintheta` is equal to
A. `(sqrt5-1)/(4)`
B. `-((sqrt5-1)/(4))`
C. `(sqrt5+1)/(4)`
D. `(-sqrt5-1)/(4)`
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Correct Answer - A
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