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If xcostheta=ycos(theta+(2pi)/(3))=zcos(...

If `xcostheta=ycos(theta+(2pi)/(3))=zcos(theta+(4pi)/(3))`, then `(1)/(x)+(1)/(y)+(1)/(z)=?`

A

1

B

2

C

0

D

`3costheta`

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ADVANCED MATHS BY ABHINAY MATHS ENGLISH-TRIGONOMETRY -EXERCISES (Multiple Choice Questions)
  1. (sin^(2)A-sin^(2)B)/(sinAcosA-sinBcosB)=?

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  2. If cosA=mcosB, then

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

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  4. 2sinAcos^(3)A-2sin^(3)AcosA=?

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

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

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

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

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  9. 1-(sin^(2)y)/(1+cosy)+(1+cosy)/(siny)-(siny)/(1-cosy)=?

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  10. (sin70^(@)+cos40^(@))/(cos70^(@)+sin40^(@))=?

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  11. If x=secphi-tanphi&y=cosecphi+cotphi, then

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  12. If (sin^(4)alpha)/a +(cos^(4)alpha)/b = 1/(a+b), show that sin^(8)alph...

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  13. If 2ycostheta=x sintheta and 2xsectheta-ycosectheta=3, then x^(2)+4y^(...

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  14. If tantheta-cottheta=a and costheta+sintheta=b, then (b^(2)-1)^(2)(a^(...

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  15. If tantheta=(sinalpha-cosalpha)/(sinalpha+cosalpha), then sinalpha+cos...

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  16. If sintheta+sinphi=aandcostheta+cosphi=b, then tan((theta-phi)/(2))=?

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  17. cos^(2)alpha+cos^(2)(alpha+120^(@))+cos^(2)(alpha-120^(@))=?

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  18. The value of sin""(pi)/(14).sin""(3pi)/(14).sin""(5pi)/(14).sin""(7pi)...

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  19. If tanA=(1)/(3)andtanB=(2)/(5) , what is the value of tan (2A+B) ?

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  20. The value of sin600^(@)cos330^(@)+cos120^(@)sin150^(@) is

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