Always remember the expression in terms of exponentials and the identity equations when dealing with trigonometric and hyperbolic functions!
The hyperbolic identity equation:
Coshx squre minus sinhx squre equals 1.
Coshx = 1/2 times the sum of e to the x and e to the negative x.
Sinhx = 1/2 times the result of e to the x minus e to the negative x.
The trigonometric identity equation:
Cosx squre plus sinx squre is equal to 1.
Sinx = 1/2 times the result of e to the power of ix take away e to the power of -ix.
Cosx = minus i/2 times the sum of e to the ix and e to the -ix.
I won't forget them hopefully.
2 comments:
晕了．．．完全不明白．．．
you've learnt sinx*sinx + cosx*cosx = 1
these are some basic equations for trigonometric and hyperbolic functions. if you say some terminology on law to me, i won't understand them either.
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