cos theta" sotve "2x-1=14-x

If x=sqrt((1-cos theta)/(1+cos theta)), then (2 x)/(1-x^(2))=

If x cos theta - sin theta =1 , then x^2 + (1 + x^2 ) sin theta equals

find the values of theta for which the line y=x cos theta+4cos^(3)theta-14cos theta-1 is a a normal to the parabola y^(2)=16x

If x+1/x=2cos theta,"Show that"x^n+1/x^n=2cos n theta

If x=sqrt((1- cos theta )/(1+ cos theta )), " then " (2 x)/(1-x^(2))=

If cos@ theta - sin^2 theta = 1/x , (x > 1), then cos^4 theta - sin^4 theta = _________________

If Delta_(1) =|{:(x, sin theta, cos theta),(-sin theta, -x, 1),(cos theta, 1,x):}| and Delta_(2) =|{:(x, sin 2theta, cos 2theta),(-sin 2theta, -x, 1),(cos 2theta, 1,x):}|, x ne 0 , then for all theta in (0, pi/2) , Then, Delta_(1) + Delta_(2) =-2x^(k) . The value of k is ________.

If Delta_(1) =|{:(x, sin theta, cos theta),(-sin theta, -x, 1),(cos theta, 1,x):}| and Delta_(2) =|{:(x, sin 2theta, cos 2theta),(-sin 2theta, -x, 1),(cos 2theta, 1,x):}|, x ne 0 , then for all theta in (0, pi/2) , Then, Delta_(1) + Delta_(2) =-2x^(k) . The value of k is ________.

If (1 + cos theta - isin theta) ( 1+ cos 2 theta + isin 2 theta) = x +iy then x^(2) + y^(2) =