Question no .9

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Here are the links for similar answer to your query :

https://www.meritnation.com/ask-answer/question/cos-27-sin-27-cos-27-sin-27-tan-72/math/3226559

https://www.meritnation.com/ask-answer/question/prove-that-cos-11-sin-11-cos11-sin-11-tan-56/trigonometric-functions/7571977

https://www.meritnation.com/ask-answer/question/prove-that-cos15-sin15-cos15-sin15-1-root-3/math/2534057

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