Answer:
See below for proof using trigonometric identities.
Step-by-step explanation:
Given expression:

Multiply the numerator and denominator by the conjugate of the denominator:

Expand the brackets:

Apply the trigonometric identity sin²θ + cos²θ ≡ 1 to the denominator:



Cancel the common factor:



Learn more about trigonometric identities here:
brainly.com/question/27938536