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Prove that: cos4A=1-8cos^2\ A+8cos^4\ A...

Prove that: `cos4A=1-8cos^2\ A+8cos^4\ A`

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Prove that cos 4A=1-8cos^2A+8 cos^4A

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Prove that : cos 4x = 1 - 8 sin^2 x cos^2 x .

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Prove that: cos^4pi/8+cos^4(3pi)/8+cos^4(5pi)/8+cos^4(7pi)/8=3/2

Prove that: cos^4pi/8+cos^4(3pi)/8+cos^4(5pi)/8+cos^4(7pi)/8=3/2

Prove that: cos^4pi/8+cos^4(3pi)/8+cos^4(5pi)/8+cos^4(7pi)/8=3/2

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Prove that: (cos8A cos5A-cos12A cos9A)/(sin8A cos5A+cos12A sin9A)=tan4A