9cos^2(x)-5sin^2(x)-5cos(x)+4=0

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Solution for 9cos^2(x)-5sin^2(x)-5cos(x)+4=0 equation:


Simplifying
9cos2(x) + -5sin2(x) + -5cos(x) + 4 = 0

Multiply cos2 * x
9cos2x + -5sin2(x) + -5cos(x) + 4 = 0

Multiply in2s * x
9cos2x + -5in2sx + -5cos(x) + 4 = 0

Multiply cos * x
9cos2x + -5in2sx + -5cosx + 4 = 0

Reorder the terms:
4 + -5cosx + 9cos2x + -5in2sx = 0

Solving
4 + -5cosx + 9cos2x + -5in2sx = 0

Solving for variable 'c'.

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

Add '-4' to each side of the equation.
4 + -5cosx + 9cos2x + -4 + -5in2sx = 0 + -4

Reorder the terms:
4 + -4 + -5cosx + 9cos2x + -5in2sx = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -5cosx + 9cos2x + -5in2sx = 0 + -4
-5cosx + 9cos2x + -5in2sx = 0 + -4

Combine like terms: 0 + -4 = -4
-5cosx + 9cos2x + -5in2sx = -4

Add '5in2sx' to each side of the equation.
-5cosx + 9cos2x + -5in2sx + 5in2sx = -4 + 5in2sx

Combine like terms: -5in2sx + 5in2sx = 0
-5cosx + 9cos2x + 0 = -4 + 5in2sx
-5cosx + 9cos2x = -4 + 5in2sx

Reorder the terms:
4 + -5cosx + 9cos2x + -5in2sx = -4 + 5in2sx + 4 + -5in2sx

Reorder the terms:
4 + -5cosx + 9cos2x + -5in2sx = -4 + 4 + 5in2sx + -5in2sx

Combine like terms: -4 + 4 = 0
4 + -5cosx + 9cos2x + -5in2sx = 0 + 5in2sx + -5in2sx
4 + -5cosx + 9cos2x + -5in2sx = 5in2sx + -5in2sx

Combine like terms: 5in2sx + -5in2sx = 0
4 + -5cosx + 9cos2x + -5in2sx = 0

The solution to this equation could not be determined.

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