Math, asked by bthakran13, 7 months ago

find without using trignometry table,prove that
cos²75+cos²15=1​

Answers

Answered by 17rts040240
4

cos²15 can be written as sin²75 so we can get the equation as cos²75+sin²75 (sin²A+cos²A=1),where A=75°

Therefore,cos²75+cos²15=1

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