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Hey can someone show me how to prove that cosh3x = 4cosh^3x - 3coshx plz...
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Please, try to use these identities: \[\cosh(x+y)=\cosh x \cosh y+\sinh x \sinh y\] and: \[\sinh(x+y)=\sinh x \cosh y+\cosh x \sinh y\] hint: \[\cosh(3x)=\cosh(2x+x)=...\]
thank you but am suppose to solve it using exponents...:(
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