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Start by simplifying the left side of the identity: $\cot\left(- \infty \right)\cos\left(- \infty \right)+\sin\left(- \infty \right)$
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$-\cot\left(\infty\right)\cos\left(\infty\right)-\sin\left(\infty\right)=\csc\left(-\infty\right)$
Learn how to solve problems step by step online. Prove the trigonometric identity cot(-infinity)cos(-infinity)+sin(-infinity)=csc(-infinity). Start by simplifying the left side of the identity: \cot\left(- \infty \right)\cos\left(- \infty \right)+\sin\left(- \infty \right). Starting from the right-hand side (RHS) of the identity. Since the expression on the right of the equality is too simple, it's not clear how we can proceed to prove the identity from there. Although we know that the identity is true.