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Trigonometric Identities


Definition

In mathematics, trigonometric identities are equalities that involve trigonometric functions and are true for every single value of the occurring variables where both sides of the equality are defined.

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Problems Solved

Prove the identity $\tan\left(-x\right)=-tanx$
Prove the identity $\frac{cos\left(x\right)}{sen\left(x\right)}=\frac{1}{tan\left(x\right)}$
Prove the identity $sen2t=2sent\cdot cost$
Prove the identity $\sec=\sin\left(\tan+\cot\right)$
Prove the identity $\sin\left(-a\right)=-\sin\left(a\right)$
Prove the identity $sen\:a\left(1+cot^2a\right)=cosec\:a$
Prove the identity $\frac{\sec\left(\infty\right)}{\tan\left(\infty\right)+\cot\left(\infty\right)}=\sin\left(\infty\right)$

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Proving Trigonometric Identities

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