2cos^2x-cosa=0

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Solution for 2cos^2x-cosa=0 equation:


Simplifying
2cos2x + -1cosa = 0

Reorder the terms:
-1acos + 2cos2x = 0

Solving
-1acos + 2cos2x = 0

Solving for variable 'a'.

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

Add '-2cos2x' to each side of the equation.
-1acos + 2cos2x + -2cos2x = 0 + -2cos2x

Combine like terms: 2cos2x + -2cos2x = 0
-1acos + 0 = 0 + -2cos2x
-1acos = 0 + -2cos2x
Remove the zero:
-1acos = -2cos2x

Divide each side by '-1cos'.
a = 2sx

Simplifying
a = 2sx

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