1.

If cos ^(-1)\ (x)/(a) + cos^(-1)\ (y)/(b) = theta, then (x^(2))/(a^(2)) +(y^(2))/(b^(2))=?

Answer»

`(XY)/(ab) cos THETA + cos^(2) theta`
`(2XY)/(ab) cos theta + cos^(2) theta`
`(2xy)/(ab) cos theta + SIN^(2) theta`
`(xy)/(ab) cos theta + sin^(2) theta`

Answer :C


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