Flag Magical Mathematics[Interesting Approach]> Convert sin7asin7a ++ sin5asin5a as a product . Solve it ..
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Convert sin7asin7a ++ sin5asin5a as a product . Solve it .. thanks a lot

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utpal raj , 5 Years ago
Grade 12
anser 2 Answers
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Vikas TU

Last Activity: 5 Years ago

Dear student
sin 7α + sin 5α
= 2 sin 7α + 5α/2 cos 7α - 5α/2, [Since, sin α + sin β = 2 sin α + β/2 cos α - β/2]
= 2 sin 6α cos α
Hope this helps
Good luck

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Sai Soumya

Last Activity: 5 Years ago

FORMULA:
sin A + sin B
= 2.sinA+B/2.sinA-B/2
Now put the values according to the question you will get it

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