Final Answer
Step-by-step Solution
Specify the solving method
Starting from the left-hand side (LHS) of the identity
Any expression divided by one ($1$) is equal to that same expression
Learn how to solve trigonometric identities problems step by step online.
$\frac{1+\sin\left(a\right)}{1}\frac{1-\sin\left(a\right)}{\cos\left(a\right)}$
Learn how to solve trigonometric identities problems step by step online. Prove the trigonometric identity (1+sin(a))/1(1-sin(a))/cos(a)=cos(a). Starting from the left-hand side (LHS) of the identity. Any expression divided by one (1) is equal to that same expression. Multiplying the fraction by 1+\sin\left(a\right). The sum of two terms multiplied by their difference is equal to the square of the first term minus the square of the second term. In other words: (a+b)(a-b)=a^2-b^2..