Try These -  Proving Trig Identities

Problem 1        tan(x) sin(x) + cos(x) = sec(x)

Problem 2               (tan^2)(x) = (csc^2)(x) * (tan^2)(x) -1

Problem 3             1/(tan(x))+ tan(x) = 1/((sin(x))(cos(x)))

Problem 4                    (1 - (cos^2)(x)) (1 + (cot^2)(x) )= 1