If angle \(\theta\) is 135o, evaluate cos\(\theta\)
a
\(\frac{1}{2}\)
b
\(\frac{\sqrt{2}}{2}\)
c
\(-\frac{\sqrt{2}}{2}\)
d
\(-\frac{1}{2}\)
Explanation
Correct Option
cVideo Explanation
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Craig Duffy
9 years ago
cos(135)
=cos(180-135)
=cos(45)
= √2/2
but since Cosine is negative in d 2nd quadrant, den d final ansa.
= - √2/2
