[" (1) axt "b=(8k)" 64k? "64],[" the scot "A=4" int ater art fas "(1-tan^(2)A)/(1+tan^(2)A)=cos^(2)*A-sin^(2)A],[" te and "7]

cos ^ (2) A-sin ^ (2) A = (1-tan ^ (2) A) / (1 + tan ^ (2) A)

If tan A=(1-cos B)/(sin B), then tan2A=tan B

If sin A=a cos B and cos A=b sin B then (a^(2)-1)tan^(2)A+(1-b^(2))tan^(2)B is equal to

If cos^(2)A-sin^(2)A=tan^(2)B then prove that 2cos^(2)B-1=tan^(2)A

If tan A = (1 - cos B)/(sin B), then what is (2 tan A )/( 1 - tan ^(2) A ) equal to ?

Find sum_(k=1)^(n)(tan^(-1)(2k))/(2+k^(2)+k^(4))

If (3-"tan"^(2)(pi)/(7))/(1-"tan"^(2)(pi)/(7))="k cos" (pi)/(7) then the value of k is

If int(1)/(cos^(2)x(1-4tan^(2)x))dx=K log|(1+2tan x)/(1-2tan x)|+c, then K=

If k tan theta=tan k theta , then prove that (sin^(2)k theta)/(sin^(2)theta)=(k^(2))/((k^(2)-1)sin^(2)theta+1).

If tanA, tanB and tan C are the roots of equation x^(3)-alpha x^(2)-beta=0 ,and (1+tan^(2)A)(1+tan^(2)B)(1+tan^(2)C)=k-1 ,then k is equal to: