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If f^(prime)(x)=asinx+bcosx and f^(prime...

If `f^(prime)(x)=asinx+bcosx` and `f^(prime)(0)=4,f(0)=3,f(pi/2)=5f(x)dot`

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`f^{prime}(x)=a sin x+b cos x`
` f^{prime}(0)=a sin 0+b cos 0=0+b=b=4` (given)
therefore` b=4`
` ...
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