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In P Q R , right-angled at Q ,\ P Q=...

In ` P Q R` , right-angled at `Q ,\ P Q=3c m` and `P R=6c m` . Determine `/_P` and `/_R` .

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In`DeltaPQR`
`cosltQPR=(PQ)/(PR)=(3)/(6)=(1)/(2)=cos60^(@)`
`rArrltQPR=60^(@)`
and `sinltPRQ=(PQ)/(PR)=(3)/(6)=(1)/(2)`
`rArrsinltPRQ=sin30^(@)`
`rArrltPRQ=30^(@)`
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  13. If asintheta+bcostheta=c then prove that acostheta-bsintheta=sqrt(a^2+...

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