Question

why cos x = - sin x​

Answer 1

Answer:

Sorry, you are misconcepted!

Explanation:

Dear when we differentiate cosx then we get it as -sinx.

As usual,

It is not equal to -sinx.

Kindly check wether your concepts are clear or not?

Thanks!

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Answer 2

Answer:

differentiation of cos X = - sin x

or you can say d(cos x)/dt = - sin x