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If y=sinx+cosx" then "(d^(2)y)/(dx^(2)) ...

If `y=sinx+cosx" then "(d^(2)y)/(dx^(2))` is :-

A

`sin x- cos x`

B

`cos x- sin x`

C

`-(sin x+ cos x)`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
C
`y=sin x+cos x`
`(dy)/(dx) =cos x-sin x`
`(d^(2)y)/(dx^(2))=-sin x -cos x`
`=-(sin x + cos x)`
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