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If $A = 280 °$ and $x = \sin A + \cos A$ , then

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$x < 0$

$x = 0$

$x > 0$

$x \geq 0$

answer is B.

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Detailed Solution

$x = \sin 280 ° + \cos 280 °$

$\sin θ + \cos θ < 0$

if $θ \in (\frac{3 π}{4}, \frac{7 π}{4})$

$∴$ $x < 0$

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