Trigonometry
If A = 1300 and x = sinA + cosA, then
a) x > 0
b) x < 0
c) x = 0
If A = 1300 and x = sinA + cosA, then
a) x > 0
b) x < 0
c) x = 0
1 Answer
vikas askiitian expert
Approved Tutor Answer15 Years agox = sinA +cosA
x/root2 = sinA(1/root2) + cosA(1/root2)
1/root2 = sin45 = cos45
x/root2 = sinAcos45 + cosAsin45
x/root2 = sin(A+45)
if A is 130 then
x/root2 = sin175o > 0 (sin of angle is +ve in 2nd quadrant)
x > 0
option a) is correct
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