A=(xxis an integer and -3<into<7)
B= the set of all letters in the word trigonometry b
C= the solution set of the equation into x²+x-2=0
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Explanation:
light is a form of energy. It enables us to see the world around us In the absence of light, we would not be able to see anything.
Switch on a torch light in a dark room. The beam of light will be absolutely straight. This shows that light travels in a straight line. Propagation of light in a straight line is called as rectilinear propagation of light.
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