what is the value of cos 135
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cos 135 =cos(180-45) = -cos 45 = -1/√2
here, we get negative sign since the value of cos in 2nd quadrant is negative. since we change cos from 180, it remains as cos only without changing into sin
here, we get negative sign since the value of cos in 2nd quadrant is negative. since we change cos from 180, it remains as cos only without changing into sin
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Cos 135 degrees = cos (90 +45) = - sin45 = - 1/√2
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