Answer:
1.The probability that a person gets well is 70%,
2.the probability that the person was cured because of the medicine is 60%
Step-by-step explanation:
chance of curing by medicine=60%
chance of curing without medicine=10%
total chance of curing=60%+10%=70%
chance of person being cured by medicine=60%
The periodicity of function is 
<em><u>Solution:</u></em>
Given that we have to find the period of function
<em><u>Given function is:</u></em>

<em><u>Use the below formula:</u></em>

Thus,

Now find the periodicity of cos(x)
We know that,
periodicity of cos(x) = 
Therefore,

Thus the periodicity of function is 