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Simplifying 9cos2x + -5sin2x + -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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