Asked by Liv

Show that the following are not trigonometric identities
1.tan 2x = 2tan x
2. sec x= sqr rt 1+tan^2 x
3. sin(x+y)=sin x +sin y

Answers

Answered by Steve
pick an angle and show that the equation fails.

tan(pi/2) ≠ 2 tan(pi/4)
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