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If f(x)=2(1+sin x), then evaluate f((pi)...

If `f(x)=2(1+sin x),` then evaluate `f((pi)/(2))`.

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The correct Answer is:
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`f(x)=2(1+sinx)`
`implies f((pi)/(2))=2(1+sin(pi)/(2))`
`=2(1+1)=4`
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