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Help in TRIGONOMETRY!!!

please solve this

Note by Ashley Shamidha
2 years, 4 months ago

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Write \(\sin^2 x = \frac {1}{2} (1-\cos 2x)\). You will get an A.P in angles during summation.Just apply the formula. Akshay Bodhare · 2 years, 4 months ago

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The answer is 19/2, but please tell me how. Ashley Shamidha · 2 years, 4 months ago

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