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Verify cos3A=4cos^(3)A-3cosA, when A = 3...

Verify `cos3A=4cos^(3)A-3cosA`, when A = `30^(@)`

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Prove that cos3A=4cos^3 A-3cosA

If A=30^@ verify that cos3A=4cos^3A-3cosA

If A=30^@ verify that cos3A=4cos^3A-3cosA

If A=30^(@) verify that cos3A=4cos^(3)A-3cos A

Evaluate : (cos3A-3cos4A)/(sin3A+2sin4A)," when "A=15^(@) .

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If sinA+cosA=m an sin^(3)A+cos^(3)A=n, then

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