7. Prove that sin 4 A- cos 4 A = sin 2A –cos2 A (A)
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Answer:
\textbf{The Identities Uesd} :
1+tan²A=sec²A
1+cot²A=cosec²A
sin²A+cos²A=1
cosecA=\dfrac{1}{sinA}
secA=\dfrac{1}{cosA}
Explanation:
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