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Answer:
Step-by-step explanation:
<u>Substitute:</u>
<u>Then the expression becomes:</u>
The result is 1 regardless the value of x other than 1.
Answer:0.175 m/s
Step-by-step explanation:
Given
Two sides of length 9 and 13 m
angle between them is increasing at an angle of 0.02 rad/min
rate of increasing of third at 
let a=9
b=13
c=unknown side
Now using cos rule of triangle


Differentiating both sides we get

at 
c=11.53 m
substituting values we get

