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Trigonometry> please solve this question...

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Prove that

Sin² 12 +sin²21+sin2 39 +sin²48 = 1+sin² 9+sin² 18

Neha Jain , 13 Years ago

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1 Answers

Neha Jain

Last Activity: 13 Years ago

Sorry the exact question is:

instead of sin 2 39 it is sin² 39

Sin² 12 +sin²21+sin² 39 +sin²48 = 1+sin² 9+sin² 18

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