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Flag Trigonometry> Prove That: sinA-sin3A+sin5A-sin7A ------...
question mark

Prove That:
sinA-sin3A+sin5A-sin7A
------------------------------------- =cot2A
cosA-cos3A-cos5A+cos7A

Arshak shan , 8 Years ago
Grade 11
anser 1 Answers
Vikas TU

Last Activity: 8 Years ago

Apply sinc – sind formulaes in numerator and cosc – cosd in denmoinator with first (2-2)pair
and U would sort out in the finally to cot2a.

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