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If sin x is G.M of sin y and cos y, then find the value of cos 2x. Ans.2cos2(pi/4 + x)

Raj , 6 Years ago
Grade 11
anser 1 Answers
Arun

Last Activity: 6 Years ago

Dear student
 
sin²x = sin y cosy
 
Now
 
Co2 x = 1 - 2 sin²x = 1 - 2 siny sosy = 1 - sin2y
 
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