11*cos^(4)2x

Find the extreme values of 11 cos^(2) x+ 15 sin x cos x- 9 sin^(2) x .

Evaluate: int(cos2x sin4xdx)/(cos^(4)x(1+cos^(2)2x))

If sin^(4)2x+cos^(4)2x=sin2x*cos2x then x=

int_(0)^(11)cos x-cos^(2)x+cos^(3)x-cos^(4)x+...oo dx

Show that cos(pi/11)cos((2pi)/11)cos((3pi)/11)cos((4pi)/11)cos((5pi)/11)=1/32

5.if the expression cos^(2)((pi)/(11))+cos^(2)((2 pi)/(11))+cos^(2)((3 pi)/(11))+cos^(2)((4 pi)/(11))+cos^(2)((5 pi)/(11)) has the value equal to p/q in it lowest from ; then find (p+q)

5. if the expression cos^2(pi/11)+cos^2((2pi)/11)+cos^2((3pi)/11)+cos^2((4pi)/11)+cos^2((5pi)/11) has the value equal to p/q in it lowest from ; then find (p+q)

If the expression cos^2(pi/11)+cos^2((2pi)/11)+cos^2((3pi)/11)+cos^2((4pi)/11)+cos^2((5pi)/11) has the value equal to p/q in it lowest from ; then find (p+q)

int_-1^1 x^11 cos^4 x dx is equal to :

The general solution of the equation sin(11x)+cos(2x)=-2, is