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UPSC CDS Math Trigonometric Ratios and Trigonometric Identities Questions

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Question : 90

Total: 107

What is

(sin‌x‌cos‌y+cos‌x‌sin‌y)(sin‌x‌cos‌y−cos‌x‌sin‌y)

cos2x−cos2y
cos2x−sin2y
sin2x−cos2y
sin2x−sin2y

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