Flag Trigonometry> Given sin2x. Sin3x=sin2x.sin7x prove that...
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Given sin2x. Sin3x=sin2x.sin7x prove that x=10 degreePlz answer asap

Twinkle Arora , 7 Years ago
Grade 11
anser 1 Answers
Spacspade

Last Activity: 7 Years ago

Bringing all terms to the LHS, 
sin2x (sin3x – sin7x) = 0
- 2.(sin2x)^2.cos5x = 0
 
So x is coming out to be = 0 degree or pi/10 ie, 18 degrees. Are you sure you have to prove x=10??                                                                                                                                                                                                                                                                                                                      
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