Question

sinx is a periodic function with period
(c) 2 = ax + by + C 270 (d)
(a)
z = ax + by * (b) 2 = a (x + y) + b 2
41 Z = ax – by + a
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Answer 1

Answer:

The function f(x)=cosx+cosax will be periodic if a is rational.

And the period of the function f(x) be the LCM of the periods of cosx and cosax.

Now cosx is periodic function of period 2π and cosax is periodic of period

a

2π

for a being rational, for a



=0.