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Prove that 70^@=tan 20^@+2 tan 50^@...

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

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Prove that tan 70^@=tan 20^@+2tan50^@

Prove that tan 70^@ = tan 20^@ + 2 tan 50^@ .

Prove that tan 20^@tan 40^@ tan 60^@ tan 80^@ = 3

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

Prove that, tan 70^(@) - tan 50^(@) + tan 10^(@) = sqrt3

Prove that tan 1^@ tan 2^@ tan 3^@........ tan 88^@tan89^@=1

Prove that tan 7^@ tan23^@ tan60^@tan67^@tan83^@ = sqrt3 .

Show that tan50^@=tan40^@+2tan10^@

Prove that tan70^(@)=2tan50^(@)+tan20^(@) .

Prove that : tan 70^(@)+ tan 10^(@)- tan 50^(@)= sqrt(3)

PATHFINDER-TRIGONOMETRIC RATIOS AND IDENTITIES-QUESTION BANK
  1. find tan 75^@

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  2. Find the value of tan 13 pi/12

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

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  4. if A+B=45^@ find the value of (1+tan A)(1+ tan B)

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  5. If 0lt betalt alpha lt(pi/4),cos(alpha+beta)=3/5 and cos(alpha-beta)=4...

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  6. If 2 sin alpha cos beta sin gamma =sin beta sin (alpha +gamma) then pr...

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  7. if cos(x-y)cosx and cos(x+y) are in H.P then evaluate abs (cos x.secy/...

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  8. Prove that tan A+2 tn A+4 tan A+8cot 8A=cot A

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  9. Evaluate : cos12^@cos24^@cos36^@cos48^@cos72^@cos84^@

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  10. If alpha,beta,gamma are in A.P. show that cot beta=(sin alpha-sin gamm...

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  11. prove sin alpha+sin(alpha+(2pi)/3)+sin (alpha+(4pi)/3)=0

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  12. Prove that (cos 7x+cos 5x)/(sin7x-sin 5x)=cotx

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  13. if tan( (pi)/9),x, tan ((5pi)/18) are in A.P. and tan(pi/9), y,tan ((7...

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  14. find the value of k which satisfy tan theta +tan(theta+pi/3)+tan (thet...

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  15. sin^3x.sin3x=underset(mrarr0)(oversetnsumCmcosmx is an identity in x,w...

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  16. Find sin( (pi)/n)+sin ((3pi)/n)+sin ((5pi)/n)+……..to n terms

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  17. Find theta if sin theta -cos theta lt0

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  18. Find A/2 if 2sin (A/2)=sqrt(1+sin A)+sqrt(1-sin A)

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  19. Find the range of A/2 if it satisfies 2 cos( A/2)=sqrt(1+sin A)-sqrt(1...

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  20. Find the maximum and minimum of 3sin 2x+4 cos 2x+3

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