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

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

Prove that cos^(-1)[(cos alpha +cos beta)/(1+cos alpha cos beta)]=2tan^(-1)("tan"(alpha)/(2)"tan"(beta)/(2))

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

Prove that: tan^(-1){(cos2 alpha sec2 beta+cos2 beta sec2 alpha)/(2)}=tan^(-1){tan^(2)(alpha+beta)tan^(2)(alpha-beta)}+tan

If cos^(-1)[(cos alpha+ cos beta)/(1+cos alpha cos beta)]=2 Tan^(-1)x then x=

If cos theta=(cos alpha+cos beta)/(1+cos alpha cos beta), prove that (tan theta)/(2)=-(tan alpha)/(2)(tan beta)/(2)

If cos alpha=(2cos beta-1)/(2-cos beta),0

If cos theta=(cos alpha-cos beta)/(1-cos alpha*cos beta), prove that tan(theta)/(2)=+-(tan alpha)/(2)(cot beta)/(2)

If cos theta=(cos alpha-cos beta)/(1-cos alpha cos beta), prove that (tan theta)/(2)=+-(tan alpha)/(2)(cot beta)/(2)