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Complementary Trigonometric Ratios

The value of ...

Question

The value of sin²20^o + cos²20^o-tan²45^o is

A

0

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B

1

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C

2

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D

3

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Solution

The correct option is A
0

1-1 = 0

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Similar questions

Q. The value of

[{sin}^{2} 20^{\circ} + {sin}^{2} 70^{\circ} - {tan}^{2} 45^{\circ}]

Q. Without using trigonometric tables, evaluate that :

\frac{{sin}^{2} 20^{\circ} + {sin}^{2} 70^{\circ}}{{cos}^{2} 20^{\circ} + {cos}^{2} 70^{\circ}} + \frac{sin (90^{\circ} - θ) sin θ}{tan θ} + \frac{cos (90^{\circ} - θ) cos θ}{cot θ}

Q. The value of

\frac{1 - {tan}^{2} 45^{\circ}}{1 + {tan}^{2} 45^{\circ}} =

Q. The value of

tan 80^{\circ} tan 10^{\circ} + {sin}^{2} 70^{\circ} + {sin}^{2} 20^{\circ}

Q. What is the value of

cos 20^{0} + cos 22^{0} + cos 158^{0} + cos 200^{0} + cos 300^{0}

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