Trig

Question 1

How to draw trig graphs in degrees without calc

Answer 1

Remember cos 0= 1
And that tan 90 is undefined

Then use knowledge that sim graph just pushed to the right, tan graph 180 as asymtope etc

Question 2

What does rotational symmetry about origin mean for a sin graph

Learn

Answer 2

Sin (x)=y, sin(-x) = -y

Question 3

What does symmetry about y axis mean for cos graphs

Answer 3

Cos x = cos-x too
Because shmrricalm

Question 4

What does rotational symmetry about origin mean for tan graph

Answer 4

Tan (x)=y, tan (-x) = -y

Question 5

Three SMALL ANGLE APPROXIMATIONS ?
Just learn

How you use?

Answer 5

sinx roughly x
Tan x roughly x

Cosx roughly 1- x^2/2

Sub in whatever value in the trig for x

Question 6

Radian formala for arc length and sector area

Answer 6

Arc length = r theta
Sector area = 1/2 r^2 theta

Question 7

When can you use small angle approximation (2)

Answer 7

Only for small angles (lmao)

And only when angle is in RADIAN

Question 8

FIND GRADIENTS OF LINE AND SUB IN MAN

Answer 8

!

Question 9

REMEMBER IF IT SAYS EXACT KEEP EXACT AND WHEN LOGGING USE SAME BASE TO REMOVE A NUMBER AND TRY BOTH SIDES!

Question 10

WRITE DOWN ALL PROBABILTIES, AS IN can be repeated number, and DIFFERENT ARRANGEMENTS

Probability means the same number twice aswell! Don’t mess up

Question 11

Large data set. Remember data is given in proportions , so largest increase doesn’t necceadily mean total largest increase