10=9-8cos(15t)

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Solution for 10=9-8cos(15t) equation:


Simplifying
10 = 9 + -8cos(15t)

Remove parenthesis around (15t)
10 = 9 + -8cos * 15t

Reorder the terms for easier multiplication:
10 = 9 + -8 * 15cos * t

Multiply -8 * 15
10 = 9 + -120cos * t

Multiply cos * t
10 = 9 + -120cost

Solving
10 = 9 + -120cost

Solving for variable 'c'.

Move all terms containing c to the left, all other terms to the right.

Add '120cost' to each side of the equation.
10 + 120cost = 9 + -120cost + 120cost

Combine like terms: -120cost + 120cost = 0
10 + 120cost = 9 + 0
10 + 120cost = 9

Add '-10' to each side of the equation.
10 + -10 + 120cost = 9 + -10

Combine like terms: 10 + -10 = 0
0 + 120cost = 9 + -10
120cost = 9 + -10

Combine like terms: 9 + -10 = -1
120cost = -1

Divide each side by '120ost'.
c = -0.008333333333o-1s-1t-1

Simplifying
c = -0.008333333333o-1s-1t-1

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