If `cosx/a=cos(x+theta)/b=cos(x+2theta)/c=cos(x+3theta)/d` then `(a+c)/(b+d)` is equal to `(A)a/d (B)c/d (C)b/c (D)d/a`

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

If (cosx)/a=(cos(x+theta))/b=(cos(x+20))/c=(cos(x+3theta))/d then (a+c)/(b+d) is equal to (a) a/d (b) c/b (c) b/c (d) d/a

If (cosx)/a=(cos(x+theta))/b=(cos(x+20))/c=(cos(x+3theta))/d then (a+c)/(b+d) is equal to (a) a/d (b) c/b (c) b/c (d) d/a

(cos x)/(a)=(cos(x+theta))/(b)=(cos(x+20))/(b)=(cos(x+3 theta))/(d) then (a+c)/(b+d) is equal to (a)(a)/(d) (b) (c)/(b)(c)(b)/(c)(d)(d)/(a)

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

If cos 5theta=a cos theta+ b cos^(3) theta+c cos^(5)theta+d , then

If cos 5theta=a cos theta + b cos^(3)theta+c cos^(5) theta+d , then

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