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Find the value of 3cos20^(@)-4cos^(3)20^...

Find the value of `3cos20^(@)-4cos^(3)20^(@)`.

A

`(sqrt(3))/(2)`

B

`-(1)/(2)`

C

`(1)/(sqrt(2))`

D

`(2)/(sqrt(3))`

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ADVANCED MATHS BY ABHINAY MATHS ENGLISH-TRIGONOMETRY -EXERCISES (Multiple Choice Questions)
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  2. Find the value of 3sin20^(@)-4sin^(3)20^(@).

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  3. Find the value of 3cos20^(@)-4cos^(3)20^(@).

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  4. If cos^(2)alpha+cos^(2)beta=2, the value of tan^(3)alpha+sin^(5)beta i...

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  5. Find the value of tan^(n)1^(@)tan^(n)2^(@)tan^(n)3^(@)......tan^(n)8...

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  6. Find the value of tan^(n)1^(@)tan^(n)2^(@)tan^(n)3^(@)......tan^(n)8...

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  7. The product cos1^(@)cos2^(@)cos3^(@)cos4^(@)......cos100^(@). Is equal...

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  8. Find the value of cos1^(@).cos2^(@).cos3^(@).cos90^(@)

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  9. Find the value of sin1^(@).sin2^(@).sin3^(@)…sin180^(@).

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  10. Find the value of sin^(2)1^(@)+sin^(2)2^(@)+sin^(2)3^(@)+ ----+sin^(...

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  11. Find the value of cos^(2)1^(@)+cos^(2)2^(@)+cos^(2)3^(@)+ -----+cos^...

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  12. sin^(2)5^(@)+sin^(2)10^(@)+sin^(2)15^(@)+ .....+sin^(2)85^(@)+sin^(2)9...

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  13. Find the value of sin10^(@).sin30^(@).sin50^(@).sin70^(@).

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  14. Find the value of tan4^(@).tan43^(@).tan47^(@).tan86^(@).

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  15. Find the value of cot10^(@).cot20^(@).cot60^(@).cot70^(@).cot80^(@).

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  16. The value of tan10^(@)tan15^(@)tan75^(@)tan80^(@) is

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  17. tan""(pi)/(8)tan""(pi)/(12)tan""(3pi)/(8)tan""(5pi)/(12)-sin^(2)""(pi)...

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  18. Find the value of cot""(pi)/20.cot""(3pi)/20.cot""(5pi)/20.cot""(7pi)/...

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  19. Solve sqrt(2+sqrt(2+sqrt(2+2cos16theta)))

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  20. Find the value of tan70^(@).

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