If `tan alpha=(1)/(7)` and `tan beta=(1)/(3)`, then `cos2 alpha` is equal to

tan alpha=(1)/(7),tan beta=(1)/(3), then cos2 alpha=

If tan alpha=(1)/(7),tan beta=1/3, then cos2 alpha is equal to adot s in2 beta b.s in4 beta c.s in3 beta d*cos2 beta

If tan alpha=(m)/(m+1) and tan beta=(1)/(2m+1) then alpha+beta is equal to

If tan alpha = 1/3 and tan beta = 1/2 , then: tan(alpha + beta) =

If tan(alpha+beta)=2andtan (alpha-beta)=1 , then tan(2alpha) is equal to

If tan alpha=(1+2^(-x))^(-1), tan beta=(1+2^(x+1))^(-1) then alpha+beta equals

If cos(alpha+beta)+sin(alpha-beta)=0 and 2010tanbeta+1=0 then tan alpha is equal to