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If xcostheta+ysintheta=z, then what i...

If `xcostheta+ysintheta=z`, then what is the value of `(xsintheta-ysintheta-ycostheta)^(2)`?

A

`x^2+y^2-z^2`

B

`x^2-y^2-z^2`

C

`x^2-y^2+z^2`

D

`x^2+y^2+z^2`

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The correct Answer is:
B
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