Math, asked by amieesusan, 3 months ago

Evaluate 2 cos² 157. 5° - 1

Answers

Answered by ashu12360

1

Step-by-step explanation:

cos 2a = 2 cos² a - 1

2 cos² (157,5)° - 1 = cos (2 . 157,5)

2 cos² (157,5)° - 1 = cos 315°

2 cos² (157,5)° - 1 = 1/2 √2

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