Question 997984
Can you please help me verify the identity tan2x=-2tanx/sec^2x-2
start with right side
-2tanx/sec^2x-2
{{{(-2tan(x))/(tan^2(x)+1-2)}}}
{{{(-2tan(x))/(tan^2(x)-1)}}}
{{{(2tan(x))/(1-tan^2(x))}}}=tan2x