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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
$2 \tan ^{2} 45^{\circ}+\cos ^{2} 30^{\circ}-\sin ^{2} 60^{\circ}$
$=2(1)^{2}+\left(\frac{\sqrt{3}}{2}\right)^{2}-\left(\frac{\sqrt{3}}{2}\right)^{2}$
$=2+\frac{3}{4}-\frac{3}{4}=2$
Standard 10
Mathematics
