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प्रश्न
Solve the following problem.
Obtain derivative of the following function: x4 + cos x
उत्तर
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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