engineering recuitment NPCIL Plant Operator Mock Test Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities
sin A + cos B = x और cos A + sin B = y है, तो sin A cos B + cos A sin B का मान ज्ञात कीजिए।
1
x2 + y2 - 2
2
x2 + y2 + 2
3
\(\frac{{{x^2} + {y^2} - 2}}{2}\)
4
\(\frac{{{x^2} + {y^2} + 2}}{2}\)