Can anyone help me in this.

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Can anyone help me in this.

There's some kind of trick that I can't seem to find.

>>

>what is trigonometry

http://www.wolframalpha.com/input/?i=sin%28x%29*cos%28y%29

Back2School with you

>>

>>7810298

That isn't the problem. Computing 10-point dft is time consuming. There's somekind of trick in here

>>

DFT is a linear function, so I would write

[math] \displaystyle \cos \left ( \frac{3 \pi }{5}n \right ) \sin \left ( \frac{4 \pi }{5}n \right )= \frac{1}{2} \left ( \sin \left ( \frac{ \pi }{5}n \right )+ \sin \left ( \frac{7 \pi }{5}n \right ) \right )[/math]

and sum the 10-point DFT for the two sine functions.

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