The correct option is B 12 cos(90+θ)= sinθ Therefore, cos135=cos(90+45)= sin45= 1√(2) cos^2135=12 ...

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Higher Order Derivatives

Value of co...

Question

Value of ${c o s}^{2} 135^{\circ}$

\frac{1}{\sqrt{2}}

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- \frac{1}{\sqrt{2}}

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2

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\frac{1}{2}

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Solution

The correct option is B $\frac{1}{2}$
$c o s (90 + θ) = - s i n θ$
Therefore,
$c o s 135 = c o s (90 + 45) = - s i n 45 = - \frac{1}{\sqrt{2}}$

$c o s^{2} 135 = \frac{1}{2}$

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