Mathematics: Find all solution of the following equation in the interval [0, 2pi) No decimals. 7cos x + 9 = -2cos x

Find all solution of the following equation in

darkdestroyer0888

28.01.2022

Step-by-step explanation:

Step 1: Add 2cos(x) to both sides

7cos(x) + 2cos(x) + 9 = -cos(x) + cos(x)

9cos(x) + 9 = 0

Step 2: Subtract 9 from both sides

9cos(x) + 9 - 9 = 0 - 9

9cos(x) = -9

Step 3: Divide both sides by 9

9cos(x) / 9 = -9 / 9

cos(x) = -1

Step 4: Find x

cos^-^1(-1) = x

$\pi = x$

$x = \pi$

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lberries08

13.05.2020

alternate exterior

Step-by-step explanation:

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