Find cos θ for θ = 45°

asked Sep 10, 2022 22.1k views

11 votes

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8 votes

90°- θ = θ - 45°

= 20 = 135°

= θ - 65.5°

Dan Kruchinin answered Sep 11, 2022

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3 votes

Answer:

$\cos( \theta) \\ \cos(45) = \cos( (\pi)/(4) ) \\ = (1)/( √(2) ) \\ or \\ = ( √(2) )/(2)$

Hutjepower answered Sep 14, 2022

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