If `alpha=pi/7` then find the value of `(1/cosalpha+(2cosalpha)/(cos2alpha))`

If alpha=(pi)/(7) then find the value of ((1)/(cos alpha)+(2cos alpha)/(cos2 alpha))

If alpha=(pi)/(7), then find the value of ((1)/(cos alpha)+(2cos alpha)/(cos2 alpha))

If alpha is in first quadrant such that tan^(2)alpha=(8)/(7) , then the value of ((1+sinalpha)(1-sinalpha))/((1+cosalpha)(1-cosalpha))

If alpha+beta=pi/2 , then the maximum value of cosalpha cos beta is:

int(cos2x-cos2alpha)/(cosx-cosalpha)dx

int(cos2x-cos2alpha)/(cosx-cosalpha)dx

int(cos2x-cos2alpha)/(cosx-cosalpha)dx

int(cos2x-cos2alpha)/(cosx-cosalpha)dx

If alpha and beta are the roots of x^2-px+q=0, then the value of |[1,cos(beta-alpha),cosalpha],[cos(alpha-beta),1,cosbeta],[cosalpha,cosbeta,1]| is

If alpha=pi/12 ,prove that frac((cosalpha+isinalpha)(cos2alpha+isin2alpha))(cos3alpha-isin3alpha)=i .