Domain of Sin ³x + Cos³x.
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1
Answer:
By property of periodic function,
f(x+T)=f(x)
∴ assume least possible period i.e.,
2
π
∴f(x+
2
π
)=f(x)
sin
3
x−cos
3
x
=sin
3
x+cos
3
x⇒ wrong assumption
assume → period =π
f(x+π)=f(x)
−sin
3
x−cos
3
x
=sin
3
x+cos
3
x⇒ wrong assumption
assume → period =
2
3π
∴−sin
3
x+cos
3
x
=sin
3
x+cos
3
x⇒ wrong assumption
assume → period =2π
∴sin
3
x+cos
3
x=sin
3
x+cos
3
x correct assumption
This implies, 2π is a period of sin
3
x+cos
3
x.
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