8. Introduction to Trigonometry
easy

કિંમત શોધો :

$2 \tan ^{2} 45^{\circ}+\cos ^{2} 30^{\circ}-\sin ^{2} 60^{\circ}$

A

$4$

B

$2$

C

$3$

D

$1$

Solution

$2 \tan ^{2} 45^{\circ}+\cos ^{2} 30^{\circ}-\sin ^{2} 60^{\circ}$

$=2(1)^{2}+\left(\frac{\sqrt{3}}{2}\right)^{2}-\left(\frac{\sqrt{3}}{2}\right)^{2}$

$=2+\frac{3}{4}-\frac{3}{4}=2$

Std 10
Mathematics

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