यदि x = r sin A cos B, y = r sin A sin B तथा z = r cos A हो तो x² + y² + z² = ? - - Yadi x = r sin A cos B , y = r sin A sin B Tatha z = r cos A Ho To x& # 178 ; + y& # 178 ; + z& # 178 ; = ? Maths in hindi, trigonometry r& # 179 ; question answers in hindi pdf r& # 178 ; questions in hindi, Know About 3r& # 178 ; Maths online test Maths notes in hindi quiz book 3 r