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How to get the right side ?

Mathematics
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its easy, take inequality in use
there was once a famous quote..."one must go left to turn right"

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Other answers:

I know how to get the left side but I am having a hard time to get the right one :)
this is proving yes?
no , i am trying to solve a fourier series of sawtooth function. and this bn coefficient
hmm interesting
i believe this is @hartnn 's specialty yes?
I am new i do not know nobody in here :(
speciality ? no. M7, what is cos pi = ?
just have a look to this example in wikibidia http://en.wikipedia.org/wiki/Fourier_series
what is cos pi ?
cos pi ? it's -1 ..
and cos 2pi = ?
one
cos 3pi = ?
:) .. well what is your point ?
see the pattern .... cos n*pi = ?
cos 1pi = -1 cos 2pi = 1 cos 3pi = -1 cos 4pi = 1
yeah i see it's 1,-1,1 and so on
so cos n*pi= ?
Under which topic in math can i find such examples ..
just use generalization : cos n*pi = \(\huge (-1)^n\)
when i put 1, i get -1, when i put n=2, i get +1 and so o n
Awesome
and -cos (n*pi) = (-1)(-1)^n = ?
and i think sin n*pi will be easier for you to figure out
Hartnn thank you so much, you saved my life :)
welcome ^_^

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