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What is the cosine of 135 degrees?

User Korinna
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cos(180^0- \alpha )=-cos \alpha \\ \\ cos135^0=cos(180^0-45^0)=-cos45^0=- ( √(2) )/(2)
User Muhsin
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cos135^o=cos(90^o+45^o)=-sin45^o=-(\sqrt2)/(2)\\\\reduction\ formulas:\ cos(90^o+\alpha)=-sin\alpha
User Alec Mev
by
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