albyboyns9797 albyboyns9797

26-04-2024
Mathematics

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If f(x)=sin[π2]x+cos[−π2]x then f′(x) is, here [π2] and [−π2] greatest integer function not greater than its value
A.sin9x+cos9x
B.0
C.9cos9x−10sin10x
D.−1

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