Trigonomerty

Question 1

What is the sine rule?

Answer 1

sinA/a = sinB/b (this one would be for angles)

Question 2

What is the cosine rule?

Answer 2

a^2 = b^2 + c^2 - 2bc CosA

Question 3

What is the area of a triangle?

Answer 3

1/2 ab Sinc

Question 4

What does a sin graph look like?

Answer 4

0 at 0 degrees and then 1 at 90 and then back down to 0 at 180

Question 5

What does the cos graph look like?

Answer 5

1 at 0 degrees then 0 at 90 and -1 at 180

Question 6

What does the tan graph look like?

Answer 6

Repeats every 180 degrees, starts with just the top half

Question 7

What is the first trigonometric identity?

Answer 7

Tan@ = sin@/cos@

Question 8

What is the second trigonometric identity?

Answer 8

Sin^2@ + cos^2@ = 1

Question 9

How would you solve a trigonometric equation like sin (x + 65) = 0.7 for 0 < x < 360?

Answer 9

1) find out what sin^-1 is (44.4)
2) then deduct the number inside the bracket (-20.6)
3) if number is not in range add the period (-20.6 + 360 = 339)
4) do the same for the other side of the curve