cosh 2x= cosh^2x +sinh^2x
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Step-by-step explanation:
Explanation:
Use formula: coshx=ex+e−x2andsinhx=ex−e−x2
Right side:=cosh2x+sinh2x
=(ex+e−x2)2+(ex−e−x2)2
=e2x+2+e−2x4+e2x−2+e−2x4
=e2x+2+e−2x+e2x−2+e−2x4
=2e2x+2e−2x4
=2(e2x+e−2x)4
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