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I can`t solve it i tried 1000 times i think i need help so please solve it quickly

I can`t solve it i tried 1000 times i think i need help so please solve it quickly

Question Image
Grade:12th pass

2 Answers

Vikas TU
14149 Points
4 years ago
Sorry,
But your question is blurred in the attachment.
Plz write it on discusion forum by typing if u can do this.
 
Ajay
209 Points
4 years ago
I solved similar problem for another user, refer to link below
 
www.askiitians.com/forums/Trigonometry/if-cos-x-cos-2x-1-then-sin-12-x-3sin-10-x-3si_149885.htm

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