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Prove that, tan 70^(@) = 2tan 50^(@) +...

Prove that,
`tan 70^(@) = 2tan 50^(@) + tan 20^(@)`

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CHHAYA PUBLICATION-TRIGONOMETRIC RATIOS OF COMPOUND ANGLES-Short Answer Type Questions
  1. Prove that, sin^(2) (pi/8 + theta/2) - sin^(2)(pi/8 - theta/2) = 1/s...

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  2. Prove that, cos^(2) A + cos^(2) (A + pi/3) + cos^(2) (A - pi/3) = 3/...

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  3. Prove that, tan 70^(@) = 2tan 50^(@) + tan 20^(@)

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  4. Simplify: cosA sin(B - C) + cos B sin (C - A) + cosC sin(A -B)

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  8. Find the expansion: sin (A - B + C)

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  12. If A + B + C = pi " and " cos A = cos B cos C, "show that" tan A = t...

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  13. If A + B + C = pi " and " cos A = cos B cos C, "show that" 2 cot B c...

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  14. An angle theta is divided into two parts alpha " and " beta such that ...

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  15. If tan theta = (Q sin alpha)/(P + Q cos alpha), "prove that", tan (alp...

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  18. Find the value of (sin (alpha + beta))/(sin (alpha - beta)), "given th...

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  20. If tan alpha = (x sin beta)/(1-x cos beta) " and " tan beta = (y sin a...

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