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Statement I: cos 52^(@)+cos68^(@)+cos172...

Statement I: `cos 52^(@)+cos68^(@)+cos172^(@)=1/2`
Statement II: `4sin Acos^(3)A-4cosAsin^(3)A=cos4A`
Which of the above statements is correct?

A

only I

B

only II

C

Both I and II

D

Neither I nor II

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The correct Answer is:
D
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AAKASH SERIES-TRANSFORMATIONS AND INDENTITIES-PRACTIVE EXERCISE
  1. If (sin A-sinC)/(cosC-cosA)=cotB then angles A,B,C are in

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  2. sinx+siny=3/4 andsinx-siny=2/5 then (tan((x-y)/2))/(tan((x+y)/2))=

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  3. tan theta tan (theta+60^(@))+tan theta tan (theta-60^(@))+tan (theta+6...

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  4. cos(x-y)=3cos(x+y) then cotxcoty=

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  5. (sin(alpha+beta))/(sin(alpha-beta))=(a+b)/(a-b) then (tan alpha)/(tan ...

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  6. If sin 2 x=n sin 2y then (Tan (x+y))/(Tan(x-y))=

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  7. If tan beta =cos theta tan alpha then "cot"^(2)(theta)/2=

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  8. If Tan theta(1)=k cot theta(2) then(cos (theta(1)+theta(2)))/(cos (the...

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  9. If cos theta = ( cos alpha - cos beta )/(1- cos alpha cos beta ) " the...

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  10. If cos theta =(a cos phi+b)/(a+bcosphi) then ("tan"(theta)/2)/("tan"(p...

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  11. In DeltaABC, (sin2A+sin2B+sin 2C)/(sinA+sinB+sinC)=

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  12. If A+B+C=180^(@) then cos A+cos B-cosC=

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  13. If A+B+C=0^(@) then sin A +sin B+sin C=

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  14. If A+B+C=270^(@) then sin 2A+sin2B+sin2C=

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  15. If A+B+C=0^(@) then sin A +sin B+sin C=

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  16. cos 22^(@)+cos 78^(@)+cos80^(@)=

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  17. Statement: If sin A =sin B, cos A=cos B then A=2n pi +B Statement :I...

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  18. Statement I: cos 52^(@)+cos68^(@)+cos172^(@)=1/2 Statement II: 4sin ...

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  19. A=sin78^(@)-sin18^(@)+cos132^(@) B=cos12^(@)+cos84^(@)+cos132^(@)+co...

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  20. Assertion A: In DeltaABC, sum(cos A)/(sin B sin C)=2 Reasin(R):In Del...

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