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Grade 11Trigonometry

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

Profile image of Arshak shan
10 Years agoGrade 11
Answers icon

1 Answer

Profile image of Vikas TU
10 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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