converting sinusoidal signal into fourier transform without using built in function

2019 12 22
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Hello guys!
I really need your help to comput this signal to fourier transform without using built in function
F3= 5*sin (2 *pi*60*t) + 2.5*cos (2*pi*120*t)
Also, I want to find its magnitude and phase plot..
THANK YOU IN ADVANCE...

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