SOLUTION: Show the following identities. A). {{{cosx+sinx/cosx-sinx - cosx-sinx/cosx+sinx = 2tan2x}}} B). {{{cos^4theta - sin^4theta = cos 2theta}}} C). {{{ (cos(alpha+bet

Question 1129886: Show the following identities.
A).
B). AMP Parsing Error of [cos^4theta - sin^4theta = cos 2theta]: Invalid function '\theta-sin^4\theta=cos2\theta': opening bracket expected at /home/ichudov/project_locations/algebra.com/templates/Algebra/Expression.pm line 70. .

C).
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!

A).

..............use and

B).

C).

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