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Find the value of (iii)tan(7pi)/6...

Find the value of
(iii)`tan(7pi)/6`

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PREMIERS PUBLISHERS-TRIGONOMETRY-SOLUTION TO EXERCISE 3.4
  1. Find the value of cos 105^(@)

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  2. Find the value of sin 105^(@)

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  3. Find the value of (iii)tan(7pi)/6

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  4. Prove that cos (30^(@) + x) = (sqrt(3) cos x - sin x)/(2)

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  5. Prove that cos (pi + theta) = - cos theta

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  6. Prove that sin (pi + theta) = - sin theta

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  7. Find the quadratic euation whose roots are sin75^o and cos 75^o

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  8. Expand cos ( A + B + C). Hence prove that cos A cos B cos C = sin A si...

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  9. Prove that sin (45^(@) + theta) - sin (45^(@) - theta) = sqrt(2) sin...

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  10. Prove that sin (30^(@) + theta) + cos (60^(@) + theta) = cos theta

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  11. If a cos (x + y) = b cos (x - y), show that (a + b)tan x = (a - b) cot...

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  12. Prove that sin 105^(@) + cos 105^(@) = cos 45^(@)

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  13. Prove that sin75^o -sin15^o =cos105^o +cos15^o

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  14. Show that tan 75^(@) + cot 75^(@) = 4

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  15. Prove that cos (A + B) cos C - cos (B + C) cos A = sin B sin (C - A)

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  16. Prove that sin (n + 1)theta sin (n - 1) theta + cos (n + 1)theta cos (...

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  17. If x cos theta = y cos (theta + (2pi)/(3))= z cos (theta + (4pi)/(3)) ...

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  18. Prove that sin ( A + B) sin (A - B) = sin^(2) A - sin^(2)B.

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  19. Prove that cos (A + B) cos (A - B) = cos^(2) A - sin^(2) B = cos^(2) ...

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  20. Prove that sin^(2)(A + B) - sin^(2)(A - B) = sin 2A sin 2B

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