Question

7. Prove that sin 4 A- cos 4 A = sin 2A –cos2 A (A)

Answer 1

Answer:

\textbf{The Identities Uesd} :

1+tan²A=sec²A

1+cot²A=cosec²A

sin²A+cos²A=1

cosecA=\dfrac{1}{sinA}

secA=\dfrac{1}{cosA}

Explanation: