Show that `sqrt(1-cos^2 alpha)`.

.If alpha+beta=90^(@), show that sqrt(cos alpha*csc beta-cos alpha*sin beta) = sin alpha

Show that sin A = sqrt(1-cos^2 A) .

Show that sin A = sqrt(1-cos^2 A) .

Show that sin A = sqrt(1-cos^2 A) .

Show that sin A = sqrt(1-cos^2 A) .

If (sqrt(2)cos alpha)/sqrt(1-cos2 alpha)=1/7 and sqrt((1+cos 2 beta)/2)=1/sqrt10,alpha,beta in (pi/2,pi) , then tan (2 alpha - beta) is equal to ........

Show that cos^(-1)((cos alpha+cos beta)/(1+cos alpha cos beta))=2tan^(-1)(tan((alpha)/(2))tan((beta)/(2)))

If pi

If alpha and beta are positive.acute angles and cos2 alpha=(n cos2 beta-1)/(n-cos2 beta)(n<1), show that sqrt(n-1)tan alpha=sqrt(n+1)tan beta

Sum the series: sqrt(1+cos alpha)+sqrt(1+cos 2alpha)+sqrt(1+cos 3alpha) +.......to n terms, where 0ltalphaltpi