cosh 3x=4 cosh³x-3 cosh x
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Answered by
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Answer:
idk about cosh it's not in my class i am sorry
Answered by
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Explanation:
cos3x=cos(2x+x)
=cos2xcosx−sin2xsinx
=(−1+2cos
2
x)cosx−2cosxsinxsinx
=−cosx+2cos
3
x−2sin
2
xcosx
=−cosx+2cos
3
x−2(1−cos
2
x)cosx
=−3cosx+4cos 3 x
Hence, cos3x=4cos
3x−3cosx
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