What is the exact value of \cos135 ?

Kathy Williams 2021-12-12 Answered
What is the exact value of cos135 ?
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aquariump9
Answered 2021-12-13 Author has 40 answers
Explanation:
cos135=cos(45+90)=cos45=12
or
cos135=cos(18045)=cos45=12
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Lakisha Archer
Answered 2021-12-14 Author has 39 answers
Cos 135° is an angle in the second quadrant.
In the second quadrant, cos is negative. cosθ=xr
cos135=cos(18045)=cos45
An angle of 45 is found ina a right-angled triangle of sides 1:1:2
cos45=12
cos135=cos45=12
Note that 2 is an irrational number and cannot be given as an exact decimal.
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