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cosA+cos(240^(@)+A)+cos(240^(@)-A)=?...

`cosA+cos(240^(@)+A)+cos(240^(@)-A)=?`

A

cosA

B

0

C

`sqrt(3)sinA`

D

`sqrt(3)cosA`

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ADVANCED MATHS BY ABHINAY MATHS ENGLISH-TRIGONOMETRY -EXERCISES (Multiple Choice Questions)
  1. (2sinthetatantheta(1-tantheta)+2sinthetasec^(2)theta)/((1+tantheta)^(2...

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  2. If mtan(theta-30^(@))=ntan(theta+120^(@)), then (m+n)/(m-n)=?

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  3. cosA+cos(240^(@)+A)+cos(240^(@)-A)=?

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  4. 1+cos56^(@)+cos58^(@)-cos66^(@)=?

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  5. If A+B=225^(@), then (tanA)/(1-tanA).(tanB)/(1-tanB)=?

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  6. If tantheta=(xsinphi)/(1-xcosphi)&tanphi=(ysintheta)/(1-ycostheta), th...

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  7. If tanx=(b)/(a), then find the value of sqrt((a+b)/( a-b ))+sqrt((a-b)...

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  8. If cos(A+B)=alphacosAcosB+betasinAsinB, then (alpha,beta)=?

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  9. tanalpha+2tan2alpha+4tan4alpha+8cot8alpha=?

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  10. The greatest value of cos^(2)((pi)/(3)-x)-cos^(2)((pi)/(3)+x) is

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  11. (sqrt(1+sinx)+sqrt(1-sinx))/(sqrt(1+sinx)-sqrt(1-sinx))=? (x is in IV ...

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  12. If sin A = n sin B then (n-1)/(n+1) tan (A+B)/(2) is equal to

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  13. (sin^(2)A-sin^(2)B)/(sinAcosA-sinBcosB)=?

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  14. If cosA=mcosB, then

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  15. If xcostheta=ycos(theta+(2pi)/(3))=zcos(theta+(4pi)/(3)), then (1)/(x)...

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  16. 2sinAcos^(3)A-2sin^(3)AcosA=?

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  17. <b>(i) tanA+tan(180^(@)+A)+cot(90^(@)+A)+cot(360^(@)-A)=?</b> (a) 0 ...

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  18. (sin3theta+sin5theta+sin7theta+sin9theta)/(cos3theta+cos5theta+cos7the...

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  19. If ABCD is a cyclic quadrilateral then cos A + cos B + cos C + cos D ...

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  20. If (2sinalpha)/(1+cosalpha +sinalpha)=y , then prove that (1-cosalph...

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