Question

If $A = 130{^\circ}$and $x = \sin A + \cos A,$ then

• A. $x > 0$
• B. $x < 0$
• C. $x = 0$
• D. $x \leq 0$

Answer 1

Answer: (A)

$x > 0$

Answer 2

$x = \cos 40{^\circ} + \cos 130{^\circ} = 2\cos 85{^\circ}\cos 45{^\circ} > 0$.