# Solve the following problem. Obtain derivative of the following function: x4 + cos x - Physics

Sum

Solve the following problem.

Obtain derivative of the following function: x4 + cos x

#### Solution

Using "d"/"dx" ["f"_1("x") + "f"_2("x")] = ("df"_1("x"))/"dx" + ("df"_2("x"))/"dx"

For f1(x) = x4 and f2(x) = cos x

"d"/"dx" ("x"^4 + "cos x") = ("d"("x"^4))/"dx" + ("d"(cos "x"))/"dx"

= 4x3 - sin x

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#### APPEARS IN

Balbharati Physics 11th Standard Maharashtra State Board
Chapter 2 Mathematical Methods
Exercises | Q 3. (v)(ii) | Page 29