Find the angle `theta` whose cosine is equal to its tangent.

Find the angle between the lines whose direction cosines are connected by the relations l+m+n=0a n d2lm+2n l-m n=0.

Find the angle between the line whose direction cosines are given by l+m+n=0a n d2l^2+2m^2-n^2-0.

Find the angle between the lines whose direction cosines are given by the equations 3l + m + 5n = 0 and 6mn - 2nl + 5lm = 0

If sin theta=3/5 and the angle theta in the second quadrant, then find cottheta .

Find the points on the ellipse (x^2)/(a^2)+(y^2)/(b^2)=1 such that the tangent at each point makes equal angles with the axes.

Find the points on the ellipse (x^2)/(a^2)+(y^2)/(b^2)=1 such that the tangent at each point makes equal angles with the axes.

For a glass (mu= sqrt(3) ) the angle of minimum deviation is equal to the angle of the prism. Find the angle of the prism.

Find the locus of a point whose distance from (a, 0) is equal to its distance from the y-axis.

Find the angles which are equal to angleP .