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We can solve the integral $\int e^{-20}\cos\left(x\right)dx$ by applying the method Weierstrass substitution (also known as tangent half-angle substitution) which converts an integral of trigonometric functions into a rational function of $t$ by setting the substitution
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$t=\tan\left(\frac{x}{2}\right)$
Learn how to solve one-variable linear inequalities problems step by step online. Solve the trigonometric integral int(e^(-20)cos(x))dx. We can solve the integral \int e^{-20}\cos\left(x\right)dx by applying the method Weierstrass substitution (also known as tangent half-angle substitution) which converts an integral of trigonometric functions into a rational function of t by setting the substitution. Hence. Substituting in the original integral we get. Simplifying.