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Generate Signals in Scilab

1. Generate a signal y(t) = sin(t) + (1/3)*sin(3t) + (1/5)*sin(5t) +(1/7)*sin(7t).

2. Generate a signal y(t) = cos(t) *(1/3)*sin(3t) + (1/5) *cos(5t) *(1/7)*cos(7t).

3. Generate a signal y(t) = exp[x + 4*y] + (4^x)*(7^y).

Please anybody help me

Scilab