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If x cos alpha + y sin alpha = x cos bet...

`If x cos alpha + y sin alpha = x cos beta + y sin beta "then"`
`"tan" (alpha + beta)/2=`

A

`y/x`

B

`x/y`

C

`(x+y)/y`

D

`(x-y)/y`

Text Solution

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The correct Answer is:
A
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Knowledge Check

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