Cos² theta divided by cot² theta minus cos² theta equal to 3 prove that
If A,B,C are the interior angles of a triangle ABC then show that cosec2(b+c÷2)-tan2a÷2=1
In fig. 3, PQ and PR are tangents to the circle with centre O and S is a point on the
circle such that SQL 50 and SRM 60 . Find QSR.