If cos `67^(@) = tan x^(@)` , then x =

Prove: (sin x + cos x) / (cos ^ (3) x) = tan ^ (3) x + tan ^ (2) x + tan x + 1

If cos^(-1)x=tan^(-1)x , then sin(cos^(-1)x)=

If cos^(2)x+cos^(4)x=1 , then find the value of tan^(2)x+tan^(4)x .

If (cos x)^(y)=(tan y)^(x), prove that (dy)/(dx)=(log tan y+y tan x)/(log cos x-x sec y cos ecy)

Prove that cos ^ (- 1) ((cos x + cos y) / (1 + cos x cos y)) = 2tan ^ (- 1) (tan ((x) / (2)) tan ((y) / (2)))

prove that tan ((pi) / (4) + (1) / (2) cos ^ (- 1) ((a) / (b))) + tan ((pi) / (4) - (1) / (2) cos ^ (- 1) ((a) / (b))) = (b) / (a) cos ^ (- 1) ((cos x + cos y) / (1 + cos x cos y) ) = 2tan ^ (- 1) ((tan x) / (2) (tan y) / (2))

If tan (cos ^(-1) x)=

If cos x = tan y , cos y = tan z , cos z = tan x , then the value of sin x is :

If cos^(2) x + cos^(4) x =1 then tan^(2) x + tan^(4) x=