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If ABCD is a cyclic quadrilateral then ...

If ABCD is a cyclic quadrilateral then `cos A + cos B + cos C + cos D` is equal to

A

`2(cosA+cosC)`

B

`2(cosA+cosB)`

C

`2(cosA+cosD)`

D

0

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ADVANCED MATHS BY ABHINAY MATHS ENGLISH-TRIGONOMETRY -EXERCISES (Multiple Choice Questions)
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  2. (sin3theta+sin5theta+sin7theta+sin9theta)/(cos3theta+cos5theta+cos7the...

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

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  5. 1-(sin^(2)y)/(1+cosy)+(1+cosy)/(siny)-(siny)/(1-cosy)=?

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

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

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

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

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

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

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

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

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

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

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

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  17. If tan(A+B)=p&tan(A-B)=q, then the value of tan 2A is

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  18. (sec8A-1)/(sec4A-1)=?

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  19. In a DeltaABC,angleC=90^(@), then the equation whose roots are tan A &...

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  20. If sinA+sin2A=xandcosA+cos2A=y, then (x^(2)+y^(2))(x^(2)+y^(2)-3)=?

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