Class 11MathematicsTrigonometrical Ratios, Functions and IdentitiesTrigonometrical ratios of sum and difference of two and three angles
Easy$\cos ^{2} 75^{\circ}+\cos ^{2} 45^{\circ}+\cos ^{2} 15^{\circ}-\cos ^{2} 30^{\circ}-\cos ^{2} 60^{\circ}$ का मान है
- A$0$
- B$1$
- C$\frac{1}{2}$
- D$\frac{1}{4}$
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यदि $\sin A = -\frac{24}{25}$,$\cos B = \frac{15}{17}$,$A$ चतुर्थ चतुर्थांश में नहीं है और $B$ प्रथम चतुर्थांश में नहीं है,तो $(A+B)$ किस चतुर्थांश में स्थित है?
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सिद्ध कीजिए कि $\cot 4x(\sin 5x + \sin 3x) = \cot x(\sin 5x - \sin 3x)$
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