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Write the value of `sintheta cos(90^(@)-theta)+costheta sin(90^(@)-theta).`

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Write the value of `sintheta cos(90^(@)-theta)+costheta sin(90^(@)-theta).`
A. -1
B. 2
C. 0
D. 1
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Correct Answer - D
`cos(90-theta)=sintheta and sin(90-theta)=costheta`.
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