ashleymstep15

03.12.2021 • 

Mathematics

We will say that a positive integer is cube-free if there is no integer such that . Let be the set of all cube-free integers. We will say that a positive integer is modest if every prime factor of is less than 10 (i.e., 2, 3, 5 or 7). Let be the set of all modest integers. What is (i.e., how many cube-free modest integers are there)

Ответ:

yanmanuel2215

29.10.2021

Mathematics

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Cos x+ cos(180-x)
=cos x + (cos 180)(cosx) +sin(180)(sinx))
=cos x+{-1(cos x)+0(sinx)
Note cos 18=-1 sin 18
= cos x-cos x
=0

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