LH.S.-R.H.S. HW/ Brove-that: (1) 1-tanhf x sech'x 12 11

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Chapter1: Systems Of Linear Equations
Section1.3: Applications Of Systems Of Linear Equations
Problem 13E: Use sin0=0, sin2=1, and sin=0 to estimate sin3.
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LH.S.-R.H.S.
HW/ Brove-that:
A101-tanlf x=sech'x
) coth x-13Dcsch?x
6) sinhécFy) sinhx.coshy Fcoshx:sinhy
(4) cosh(xF y) = cosh x.cosh y + sinh x.sinh y
%3D
(5) sinh 2x = 2.sinhx.coshx
(6) cosh2x= cosh x+sinh² x =2.cosh² x-1=2.sinh² x+1
%3D
(7) coshx+sinhx=e*
%3D
(8) coshx-sinhx=e¯*
(9) cosh(-x) = cosh x. .(even)
(10) sinh(-x) =-sinh x.....(odd)
tanh x+ tanh y
1+tanh x.tanhy
(11) tanh(x+y) =
%3D
2. tanh x
(12) tanh(2x) =
%3D
1+ tanhx
fanhar).
Sinhlrex
Transcribed Image Text:LH.S.-R.H.S. HW/ Brove-that: A101-tanlf x=sech'x ) coth x-13Dcsch?x 6) sinhécFy) sinhx.coshy Fcoshx:sinhy (4) cosh(xF y) = cosh x.cosh y + sinh x.sinh y %3D (5) sinh 2x = 2.sinhx.coshx (6) cosh2x= cosh x+sinh² x =2.cosh² x-1=2.sinh² x+1 %3D (7) coshx+sinhx=e* %3D (8) coshx-sinhx=e¯* (9) cosh(-x) = cosh x. .(even) (10) sinh(-x) =-sinh x.....(odd) tanh x+ tanh y 1+tanh x.tanhy (11) tanh(x+y) = %3D 2. tanh x (12) tanh(2x) = %3D 1+ tanhx fanhar). Sinhlrex
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