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Komok [63]
3 years ago
11

What is the cosine of 135 degrees?

Mathematics
2 answers:
Varvara68 [4.7K]3 years ago
7 0
cos(180^0- \alpha )=-cos \alpha \\ \\ cos135^0=cos(180^0-45^0)=-cos45^0=- \frac{ \sqrt{2} }{2}
belka [17]3 years ago
3 0
cos135^o=cos(90^o+45^o)=-sin45^o=-\frac{\sqrt2}{2}\\\\reduction\ formulas:\ cos(90^o+\alpha)=-sin\alpha
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