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Mathematics 7 Online
OpenStudy (anonymous):

Hey can someone show me how to prove that cosh3x = 4cosh^3x - 3coshx plz...

OpenStudy (michele_laino):

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: \[\cosh(3x)=\cosh(2x+x)=...\]

OpenStudy (anonymous):

thank you but am suppose to solve it using exponents...:(

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