Question

How to get the answer of [d^42/dx^42 (sinx)] ?

Answer 1

hmm maybe not the fourth
have you got a picture of the question?

Answer 2

is the 42nd derivative?

Answer 3

@welshfella yes

Answer 4

Try observing the pattern when you differentiate sin x repeatedly
y = sinx
y'= cosx
y''= -sinx
y'''=-cosx
y''''= sinx

Which means the function of sinx repeats itself after every fourth derivative. Can you work out what the 42 derivative would be?