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A=sin78^(@)-sin18^(@)+cos132^(@) B=cos...

`A=sin78^(@)-sin18^(@)+cos132^(@)`
`B=cos12^(@)+cos84^(@)+cos132^(@)+cos156^(@)` and
`C=(sin 75^(@)+sin 15^(@))/(cos 75^(@)+cos 15^(@))` then arrange in the ascending order

A

C,A,B

B

B,A,C

C

A,C,B

D

A,B,C

Text Solution

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The correct Answer is:
B
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Explore conceptually related problems

( sin 75^(@) - sin 15^(@))/( cos 15^(@) - cos 75^(@))=

sin 78^(@) - sin 18^(@) + cos 132^(@) =

(cos 15^(@) + sin 15^(@))/(cos 15^(@) - sin 15^(@)) =

cos 12^@ + cos 84^@ + cos 132^(@) + cos 156^(@)=

cos 15^(@) - cos 75^(@) =

sin21^(@)cos9^(@)-cos84^(@) cos6^(@)=

sin 21^(@) cos 9^(@) - cos 84^(@) cos 6^(@)=

Prove that cos 12^(@) + cos 84^(@) +cos 132^(@) + cos 156^(@) =-1//2

AAKASH SERIES-TRANSFORMATIONS AND INDENTITIES-PRACTIVE EXERCISE
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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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  17. Statement: If sin A =sin B, cos A=cos B then A=2n pi +B Statement :I...

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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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