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

Prove that
`sin (pi + theta) = - sin theta`

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The correct Answer is:
`-sin theta`
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FULL MARKS-TRIGONOMETRY-Exercise 3.4
  1. Find sin (x - y) given that sin x = (8)/(17) with 0lt x lt (pi)/(2) an...

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

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

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  4. Find a quadratic equation whose roots are sin 15^(@) and cos 15^(@)

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

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

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

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

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  9. Prove that sin 75^(@) - sin 15^(@) = cos 105^(@) + cos 15^(@)

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

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

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

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

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

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  15. Show that cos^(2) A + cos^(2)B - 2 cos A cos B cos (A + B) = sin^(2) (...

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  16. If cos (alpha - beta) + cos (beta - gamma) + cos (gamma - alpha) = (-3...

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  17. Show that tan(45^(@) + A) = (1 + tan A)/(1 - tan A)

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  18. Prove that cot (A + B) = (cot A cot B - 1)/(cot A + cot B)

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  19. If tan x =(n)/(n + 1) and tan y = (1)/(2n + 1), find tan (x + y).

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  20. Prove that tan ((pi)/(4) + theta) tan ((3pi)/(4) + theta) = -1

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