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

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

A

`2cos28^(@)cos29^(@)sin33^(@)`

B

`4cos28^(@)cos29^(@)cos33^(@)`

C

`4cos28^(@)cos29^(@)sin33^(@)`

D

`2cos28^(@)cos29^(@)cos33^(@)`

Text Solution

Verified by Experts

The correct Answer is:
C
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ADVANCED MATHS BY ABHINAY MATHS ENGLISH-TRIGONOMETRY -EXERCISES (Multiple Choice Questions)
  1. If mtan(theta-30^(@))=ntan(theta+120^(@)), then (m+n)/(m-n)=?

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

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  3. 1+cos56^(@)+cos58^(@)-cos66^(@)=?

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

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

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

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

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

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

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

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

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

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  13. If cosA=mcosB, then

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

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  15. 2sinAcos^(3)A-2sin^(3)AcosA=?

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

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

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

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

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  20. 1-(sin^(2)y)/(1+cosy)+(1+cosy)/(siny)-(siny)/(1-cosy)=?

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