Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities

\(\frac{\cos^2 20^{\circ}+\cos^2 70^{\circ}}{\sin^2 90^{\circ}}-\tan^2 45^{\circ}\) యొక్క విలువెంత?

1
-2
2
-1
3
0
4
1

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