" 18.Prove that "tan4 theta=(4tan theta-4tan^(3)theta)/(1-6tan^(2)theta+tan^(4)theta)

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tan4 theta=4tan theta(1-tan^(2)theta)/(1-6tan^(2)theta+tan^(4)theta)

Prove that: tan4 theta=(4tan theta(1-tan^(2)theta))/(1-tan^(2)theta+tan^(4)theta)

Prove that: tan4theta=(4t a ntheta(1-tan^2theta))/(1-6tan^2theta+tan^4theta)

Prove the following : tan4theta = (4tantheta-4tan^3theta)/(1-6tan^2theta+tan^4theta)

Prove that : tan 4 theta = (4 tan theta - 4 tan^3 theta)/(1-6 tan^2 theta + tan^4 theta) .

Prove that : tan 4 theta= (4 tan theta(1-tan^2 theta)) /(1-6 tan^2 theta+ tan^4 theta) .

Prove that : tan 3 theta= (3 tan theta-tan^3 theta)/(1-3 tan^2 theta) .

Prove that tan(pi/4+theta/2)=sec theta+tan theta

Prove that tan^4theta+tan^2theta=sec^4theta-tan^2theta-1

Prove that: "tan"3 theta tan 2theta tan theta="tan" 3theta-"tan" 2theta-"tan" theta.