Question

Sin A minus 2 Sin cube A upon 2 cos cube A minus Cos A is equal to 10

Answer 1

See your answer in the image given below

Answer 2

Sin A - 2 Sin^3 A/ 2 cos ^3 A - cos A = tan
L.H.S. = Sin A ( 1 - 2 sin ^2 A)/ cos A ( 2cos^A-1)
= tan A ( sin^2A + cos ^2 A -2 sin^2A) / ( 2 cos^2A - sin^2A - cos ^2A)
= tan A
Hope it helps.....