Math, asked by ranade4040, 3 months ago

cos3x = 4 cos3 x - 3cosx , sec 135º=?

Answers

Answered by gummadavellibhaskarr

1

Answer:

cos135°=cos3*45°

=4cos³45°-3cos45°

4(1/2√2)-3(1/√2)

=√2-3/√2

=-1/√2

sec135°=-√2

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