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What sign has sinx + cosx for x=140 degrees

What sign has sinx + cosx for x=140 degrees

Grade:11

1 Answers

Vaibhav Gupta
73 Points
8 years ago
according to me...the sign should be positive...because 140 lies in second quadrant and sinx in second quadrant is +ve, also, sin x is increasing function and cox x is decreasing function.....therefore..the sign should be positive.
and also
according to calculator
sin 140 = 0.98023965944
cos 140 = -0.197813574
 
sin 140 + cos 140 = +0.78242608543
 
 

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