Q.202447: যদি (cos x + sin x ) = 2 cos x তাহলে (cos x - sin x) = ? |
যদি (cos x + sin x ) = 2 cos x তাহলে (cos x - sin x) = ? - - Maths in Bengali, trigonometry question answers in Bengali pdf questions in Bengali, Know About Maths online test Maths notes in Bengali quiz book