যদি $a \cos α + b \sin α = a \cos β + b \sin β$ হয়, তবে দেখাও যে, $\cos^{2} \frac{α + β}{2} - \sin^{2} \frac{α + β}{2} = \frac{a^{2} - b^{2}}{a^{2} + b^{2}}$ .(If $a \cos α + b \sin α = a \cos β + b \sin β$ , then show that $\cos^{2} \frac{α + β}{2} - \sin^{2} \frac{α + β}{2} = \frac{a^{2} - b^{2}}{a^{2} + b^{2}}$ .)

Created: 1 year ago | Updated: 1 year ago

Updated: 1 year ago

যদি $a \cos α + b \sin α = a \cos β + b \sin β$ হয়, তবে দেখাও যে, $\cos^{2} \frac{α + β}{2} - \sin^{2} \frac{α + β}{2} = \frac{a^{2} - b^{2}}{a^{2} + b^{2}}$ .(If $a \cos α + b \sin α = a \cos β + b \sin β$ , then show that $\cos^{2} \frac{α + β}{2} - \sin^{2} \frac{α + β}{2} = \frac{a^{2} - b^{2}}{a^{2} + b^{2}}$ .)

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