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

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

If a/b = c/d , then ( ( a +c )/( b + d ) ) is equal to

If cos5 theta=a cos theta+b cos^(3)theta+c cos^(5)theta+d then the value of log _(d-b)(5ac) is equal to

If cos5 theta-a cos^(5)theta+b cos^(3)theta+c cos theta then c is equal to-

If a sin x+b cos(x+theta)+b cos(x-theta)=d then the minimum value of |cos theta| is equal to

If (x)/(cos theta)=(y)/(cos(theta-(2 pi)/(3)))=(z)/(cos(theta+(2 pi)/(3))) then x+y+z is (a)1(b)0(c)-1(d) none of these

If tan theta=(a)/(b), then b cos2 theta+a sin2 theta is equal to (a)a(b)b(c)(a)/(b)(d)(b)/(a)