The value of cos(x - y) is 1/2 if angle x is in the fourth quadrant and angle y is in the first quadrant.
What is trigonometry?
Trigonometry is a branch of mathematics that deals with the relationship between sides and angles of a right-angle triangle.
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sinx = -1/2
x = 330 degrees
cosy = √3/2
y = 30 degrees
Angle x is in the fourth quadrant and angle y is in the first quadrant.
cos(330 - 30) = cos(300)
cos300 = 1/2
Thus, the value of cos(x - y) is 1/2 if angle x is in the fourth quadrant and angle y is in the first quadrant.
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