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sir i am not able to understand this from video lecture please explain?

Shubham Kumar , 6 Years ago
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Momin

Last Activity: 6 Years ago

First rearrange the terms then use the formula of sinA+sinB=2sin(A+B/2)cos(A-B/2) simplify and then find principal values by equating the products =0 

Shubham Kumar

Last Activity: 6 Years ago

please provide me complete solution for this question.i am a fresher and i do not know well how to apply these formulas as these are very bulky and it would require some time to practice.

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