1.

If (cos x )/(a)= (cos (x + theta))/( b ) = ( cos (x + 2 theta ))/( c) = (cos (x + 3 theta ))/( d)then (a+c)/(b+d) is equal to

Answer»

`a//d`
`C//d`
`b//c`
`d//a`

ANSWER :C


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