Solved on Nov 17, 2023

Find the antiderivatives of f(x)=8sec2xf(x)=-8 \sec^2 x and verify the solution by taking the derivative.

STEP 1

Assumptions1. The function we are working with is f(x)=8secxf(x)=-8 \sec ^{} x . We are looking for all antiderivatives of this function3. We will check our work by taking the derivative of the antiderivative

STEP 2

To find the antiderivative of a function, we need to find a function whose derivative is the given function. In this case, we need to find a function whose derivative is 8sec2x-8 \sec ^{2} x.

STEP 3

We know that the derivative of tanx\tan x is sec2x\sec ^{2} x. Therefore, the antiderivative of sec2x\sec ^{2} x is tanx\tan x.

STEP 4

Now, we can find the antiderivative of 8sec2x-8 \sec ^{2} x by multiplying the antiderivative of sec2x\sec ^{2} x by -8.
(x)=8tanx(x) = -8 \tan x

STEP 5

However, the antiderivative is not unique. There is a constant of integration, usually denoted by CC, that we need to add to the antiderivative. This is because the derivative of a constant is zero, so adding a constant to a function does not change its derivative.
(x)=8tanx+C(x) = -8 \tan x + C

STEP 6

Now, we will check our work by taking the derivative of (x)=8tanx+C(x) = -8 \tan x + C.

STEP 7

The derivative of tanx\tan x is sec2x\sec ^{2} x, and the derivative of a constant is zero. Therefore, the derivative of tanx+C- \tan x + C is sec2x- \sec ^{2} x.
f(x)=ddx(tanx+C)=sec2xf(x) = \frac{d}{dx}(- \tan x + C) = - \sec ^{2} x

STEP 8

The derivative of our antiderivative is equal to the original function, so our work is correct.
The antiderivatives of f(x)=8sec2xf(x)=-8 \sec ^{2} x are (x)=8tanx+C(x)=-8 \tan x + C for all real numbers CC.

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