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In a DeltaPQR , if 3 sin P+4 cos Q=6 and...

In a `DeltaPQR` , if 3 sin P+4 cos Q=6 and 4 sin Q+3 cos P=1 , then the angle R is equal to

A

`(pi)/(4)`

B

`(3pi)/(4)`

C

`(5pi)/6`

D

`(pi)/6`

Text Solution

Verified by Experts

The correct Answer is:
D
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  2. If an angle alpha is divided into two parts A and B such that A-B=x ...

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  7. sin theta + sin (120^(@) + theta ) + sin ( theta - 120^(@))=

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  9. cos 20^(@) + cos 100^(@) + cos 140^(@) =

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  10. sin 40^(@) - sin 80^(@)+ sin 160^(@)=

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  12. If A+B+C=0 , then cot A cotB + cot B cot C+ cot C cot A =

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  13. If A+C=B then tan A* tan B * tan C=

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  19. If A+B+C= pi//2 then show that cot A + cot B+ cot C=cot A cot B cot C

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