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$\cos\left(x\right)=\frac{6\sqrt{37}}{37}\sin\left(x\right)$
Learn how to solve differential calculus problems step by step online. Prove that cos(-x)=(637^1/2)/37sin(x) is not an identity. Simplifying. To prove that an equation is not an identity, we only need to find one input at which both sides of the equation result in different values. If we try with the following value. After substituting the value and simplify on the left side, we get.