Eric Nicholas K's answer to Vignesh anand's Secondary 3 A Maths Singapore question.
done
{{ upvoteCount }} Upvotes
clear
{{ downvoteCount * -1 }} Downvotes
Vignesh, a key idea for you to know, which is valid for all lines touching the horizontal x-axis, is that the gradient of that particular line is equal to the tangent of the angle that the line makes with the POSITIVE horizontal x-axis. So, here the angle it makes is 120 degrees, and the gradient will be equal to tan 120 degrees.
(In fact, the word "tangent" in "tangent to a curve" really means the trigonometric tangent; they are actually directly related in a very similar idea as this question).
(In fact, the word "tangent" in "tangent to a curve" really means the trigonometric tangent; they are actually directly related in a very similar idea as this question).
Date Posted:
3 years ago
tan 120 has a negative value since 120 is in the second quadrant, and its basic angle is 180 - 120 = 60, so tan 120 = - tan 60, where 60 is a special angle you must remember,
Thank u so much. I understood now
Thank u so much
360 Tutoring Program