Question

what is the equation of x-axis. a)x=0. b)y=0. c)x+y=0. d)x=y

Answer 1

b) y =0
because if there is no numbers on the upper side the line will be horizontal and thus will not affect the x axis.

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Answer 2

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Given that, y = sin x

Hence, dy/dx = cos x

Thus, the slope of the normal = (-1/cos x)x =0 = -1

Therefore, the equation of the normal is y-0 = -1(x-0) or x+y=0

Hence, the correct solution is option c

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Hope it's Helpful.....:)