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CONCEPT USED
SLOPE OF A STRAIGHT LINE IS GIVEN BY TANGENT FUNCTION . SUPPOSE ONE COORDINATE ON X AXIS AND OTHER ON Y AXIS THEN TAN theta IS P/B . THEN WHAT IS theta. IT IS ACTUALLY A ANGLE BY WHICH A LINE INCLIED AT X AXIS
EXPLANATION
TAN theta = slope = 1/√3
1.. then theta = inclination angle = 30 degree
2..45
3.60
4. here angle is negative tangent function is negative in second and fourth quadrant
so angle is -π/4 or π-π/4 = 3π/4
here we get two values of angles . well we get two values in all cases because one value for acute angle and another for obtuse
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