Question

What is the simplified form of cos ??

Answer 1

`(√(2) )/(2\\)`

Explanation:

A triangle has a total of 180° (B is a 90° angle)

Take 180° - 90° to find the angle of A + C which equals 90°

take 90°/2 to get the angle of C which is 45°

and to check that take 45°+45°+90°= 180°

Now...

cos (C)

cos(45°) =
`(√(2) )/(2)` [Answer]

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