Question

If y=-cos x, then y" = ?​

Answer 1

Answer:

y''= cos x

Step-by-step explanation:

y= - cos x  

y' = sin x   (as derivative of cos x is -sin x)

y''= cos x

Answer 2

If y = - cos x, then y" = sin x

Given :

y = - cos x

To find :

The value of y''

Solution :

Step 1 of 2 :

Write down the given function

Here the given function is

y = - cos x

Step 2 of 2 :

Find second order derivative

y = - cos x

Differentiating both sides with respect to x we get

y' = - ( - sin x )

⇒ y' = sin x

Again Differentiating both sides with respect to x we get

y'' = cos x

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