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if cos ^(-1 ) ""(x )/(a) + cos ^(-1 ...

if ` cos ^(-1 ) ""(x )/(a) + cos ^(-1 )""(y)/(b ) = alpha ` prove that ,
` (x^(2) )/(a^(2)) -(2xy)/(ab ) ""cos alpha +(y^(2))/(b^(2))= sin ^(2) alpha `

A

`sin^(2)alpha`

B

`cos^(2)alpha`

C

`tan^(2)alpha`

D

`cot^(2)alpha`

Text Solution

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The correct Answer is:
A
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