Eric Nicholas K's answer to LockB's Secondary 3 A Maths Singapore question.
done
{{ upvoteCount }} Upvotes
clear
{{ downvoteCount * -1 }} Downvotes
Q1, Q4a
The rest another time
The rest another time
Date Posted:
3 years ago
i dont really understand part f
It’s the tangent formula, but then it’s “upside down”.
The entire fraction is placed upside down, which is why the formula simplifies to 1/tan.
The entire fraction is placed upside down, which is why the formula simplifies to 1/tan.
why sinx=0 gives 0,180 and 360 degree tho
These are standard solutions:
sin x = 0 gives (in degrees) 0, 180, 360
tan x = 0 gives (in degrees) 0, 180, 360
cos x = 0 gives (in degrees) 90, 270
These can be seen from the graphs drawn for sin x, cos x and tan x, or we can also do the usual "quadrants" method by considering the "0" in sin x = 0, cos x = 0 or tan x = 0 as both a positive and a negative number before we do the usual quadrants method.
sin x = 0 gives (in degrees) 0, 180, 360
tan x = 0 gives (in degrees) 0, 180, 360
cos x = 0 gives (in degrees) 90, 270
These can be seen from the graphs drawn for sin x, cos x and tan x, or we can also do the usual "quadrants" method by considering the "0" in sin x = 0, cos x = 0 or tan x = 0 as both a positive and a negative number before we do the usual quadrants method.
360 Tutoring Program