Math - Special Angles

Question 1

sin0°

Answer 1

0

Question 2

sin30°

Answer 2

1/2

Question 3

sin45°

Answer 3

1/√2

Question 4

sin60°

Answer 4

√3/2

Question 5

sin90°

Answer 5

1

Question 6

cos0°

Answer 6

1

Question 7

cos30°

Answer 7

√3/2

Question 8

cos45°

Answer 8

1/√2

Question 9

cos60°

Answer 9

1/2

Question 10

cos90°

Answer 10

0

Question 11

tan0°

Answer 11

0

Question 12

tan30°

Answer 12

1/√3

Question 13

tan45°

Answer 13

1

Question 14

tan60°

Answer 14

√3

Question 15

tan90°

Answer 15

undefined

Question 16

Can I leave the denominator as a surd?

Answer 16

No. Rationalise the fraction.

Question 17

Relationship between sinA and sin(180-A)?

Answer 17

The same

Question 18

Relationship between cosA and cos(180-A)?

Answer 18

Becomes negative or positive (whichever is the opposite)

Question 19

Relationship between tanA and tan(180-A)?

Answer 19

tan(180°−A)=−tanA –> same as cosine

Question 20

Complementary Angles

Answer 20

sin(90°-θ) = cosθ
cos(90°-θ) = sinθ
tan(90°-θ) = 1/tanθ