Class 11MathematicsTrigonometrical Ratios, Functions and IdentitiesTrigonometrical ratios of sum and difference of two and three angles
Easy$\cos ^{2} 75^{\circ}+\cos ^{2} 45^{\circ}+\cos ^{2} 15^{\circ}-\cos ^{2} 30^{\circ}-\cos ^{2} 60^{\circ}$ નું મૂલ્ય શોધો.
- A$0$
- B$1$
- C$\frac{1}{2}$
- D$\frac{1}{4}$
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જો $\tan A = \frac{1}{\sqrt{x(x^2+x+1)}}, \tan B = \frac{\sqrt{x}}{\sqrt{x^2+x+1}}$ અને $\tan C = (x^{-3}+x^{-2}+x^{-1})^{\frac{1}{2}}$,જ્યાં $0 < A, B, C < \frac{\pi}{2}$,તો $A+B$ ની કિંમત શું થાય?
જો $A=35^{\circ}, B=15^{\circ}$ અને $C=40^{\circ}$ હોય,તો $\tan A \cdot \tan B+\tan B \cdot \tan C+\tan C \cdot \tan A$ ની કિંમત શોધો.
$\cos 12^\circ + \cos 84^\circ + \cos 156^\circ + \cos 132^\circ$ નું મૂલ્ય શોધો.
Easy
View Solutionજો $\sin \alpha = 1/\sqrt{5}$ અને $\sin \beta = 3/5$ હોય,તો $\beta - \alpha$ કયા અંતરાલમાં આવે છે?
Difficult
View Solutionજો $\tan A = -\frac{1}{2}$ અને $\tan B = -\frac{1}{3}$ હોય,તો $A + B = $
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