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3. Trigonometric Functions
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Q48 of 76 Page 52

The value of is

We have,



=-sin18° sin(90° - 36°)


=-sin18° cos36°




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46

The value of cos 12° + cos 84° + cos 156° + cos 132° is

47

If then tan (2A + B) is equal to

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The value of sin 50°– sin 70° + sin 10° is equal to

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If sin θ + cos θ = 1, then the value of sin 2θ is equal to

Questions · 76
3. Trigonometric Functions
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