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xcostheta-ysin^(theta)=2 और xsin^(theta)...

`xcostheta-ysin^(theta)=2` और `xsin^(theta)+ycos^(theta)=4` में से `theta` हटाने पर कौन का कथन सत्य होगा?

A

`x^(2)+y^(2)=20`

B

`3x^(2)+y^(2)=20`

C

`x^(2)-y^(2)=20`

D

`3x^(2)-y^(2)=10`

लिखित उत्तर

Verified by Experts

The correct Answer is:
a

`(xsintheta+ycos theta=4`
`(x cos theta-ysin theta-2)/((x^(2+y^(2)))(cos^(2)theta+sin^(2)theta))=4^(2)+2^(2)`
`(x^(2)+y^(2)=a^(2)+ b^(2))`
`(x^(2)+y^(2))(1)=16+4`
`x^(2)+y^(2)=20`
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