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import math
def circle_area(r: float) -> float:
return math.pi * r * r
def e_const() -> float:
return math.e
def tau_const() -> float:
return math.tau
def sine(x: float) -> float:
return math.sin(x)
def cosine(x: float) -> float:
return math.cos(x)
def exp_of(x: float) -> float:
return math.exp(x)
def ln_of(x: float) -> float:
return math.log(x)
def log10_of(x: float) -> float:
return math.log10(x)
def log2_of(x: float) -> float:
return math.log2(x)