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Grade: 9
        prove that(sin?+cos?)² - (sin?-cos?)² = 2sin2?
7 years ago

Answers : (2)

Chetan Mandayam Nayakar
312 Points
							

(sinx+cosx)2-(sinx-cosx)2=(sin2x+cos2x+2sinxcosx)-(sin2x+cos2x-2sinxcosx)=4sin(x)cos(x)=2sin2x

7 years ago
shikhar mahajan
16 Points
							

the ans. is 2

7 years ago
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