Solve- cos7AsecA-sin7Acosec A-cos 8A

We know that, cos(A+B)=cos Acos B sin Asin B cos7AsecA sin7Acosec A=cos7Acos A sin7Asin A=cos (7A+A)=cos8A ...

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Sum of Trigonometric Ratios in Terms of Their Product

Solve: cos7...

Question

Solve: $\frac{cos 7 A}{sec A} - \frac{sin 7 A}{cosec A} = cos 8 A$

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Solution

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