Question

evaluate cos495° step by step
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Answer 1

Step-by-step explanation:

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cos495  =  1 /  sin 495 .

 Find sin (495)

sin ( 495 ) = sin ( 135 + 360 ) = sin 135

Trig Table of special arcs ⇒

sin (  495  )  =  sin 135  = √ 2 /  2  

Therefore,

cos( 495 )  =  1 /  sin  =  2  / √ 2  =  √ 2

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