Math, asked by kelvinibaos, 4 months ago

cos 180° = cos² 90° - sin² 90°

Answers

Answered by rkapadiya249

0

Answer:

= cos²(90-a) +cos²(180-a)

= cos²(90-a)+cos(180-a) x cos(180-a)

= cos²(90-a) + sin²(90-(180-a))

= cos²(90-a)+sin²(90-a)

= 1

hope this helps you

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