Given cos theta 2425 and 90 degree SolutionSolution theta

Given cos theta = - 24/25 and 90 degree

Solution

Solution:

theta lies in Second quadrant.

90+

and 180-

lies in Q2.

In second quadrant sin and cosec are positive rest all are negative.

cos=-24/25

=cos^-1(-24/25)

=163.739

/2=81.869

cot(/2)=89.30 degrees