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if cos(x-y)cosx and cos(x+y) are in H.P ...

if cos(x-y)cosx and cos(x+y) are in H.P then evaluate `abs (cos x.secy/2`

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PATHFINDER-TRIGONOMETRIC RATIOS AND IDENTITIES-QUESTION BANK
  1. If 0lt betalt alpha lt(pi/4),cos(alpha+beta)=3/5 and cos(alpha-beta)=4...

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

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

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

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

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

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

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

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

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

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

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

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  13. Find theta if sin theta -cos theta lt0

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

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

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

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  17. Prove that -4le5cos theta +3 cos (theta+pi/3)+3le10 for all values of...

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  18. Find the maximum value of1+sin(pi/4+theta)+2cos(pi/4-theta) for all re...

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  19. Find cos(alpha+beta) if tan(alpha/2) and tan (beta/2) are roots of the...

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  20. If sec alpha and cosec alpha are the roots of x^2-px+q=0 then prove...

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