Trignonometry

Question 1

What do you do if there’s a negative value?

Answer 1

Drop negative, tick opposite on the SACT diagram.

Question 2

What if it’s sinx=1

Answer 2

Draw a diagram and plot where the graph hits the 1.

Question 3

Sin2x - what do you do?

Answer 3

Add an extra round of 360 to your answers then half the final answer.

Question 4

3sin^2x-2sinx-1=0 - What do you do?

Answer 4

Change to a’s and work algebraically down two lanes.

Question 5

What happens when dealing with a cos^2x=4

Answer 5

It’s the same as (cosx)^2, root and do a PLUS or MINUS value.

Question 6

What do you do if it’s tan(3x-20)

Answer 6

Add on two extra round of 360, add on 20, divide your answer by 3.

Question 7

Cos(2x+pie/3)=0.812

Answer 7

Use radians on calculator, take pie for 3.14, give answer in radians.

Question 8

Find exact value of sin75

Answer 8

Use compound formula, sin(45+30) expand and solve.

Question 9

Trig Identities

Answer 9

Singerine over cosgerine equals tangerine.

Sin squared x plus cos squared x equals one.