Learn how to solve trigonometric equations problems step by step online. Solve the trigonometric equation 6cos(x)^2-cos(x)+-2=0. We can try to factor the expression 6\cos\left(x\right)^2-\cos\left(x\right)-2 by applying the following substitution. Substituting in the polynomial, the expression results in. Factor the trinomial 6u^2-u-2 of the form ax^2+bx+c, first, make the product of 6 and -2. Now, find two numbers that multiplied give us -12 and add up to -1.

Solve the trigonometric equation 6cos(x)^2-cos(x)+-2=0