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