Exercise 5 – 3:
1.For each expression select the closest answer from the list provided:
a)cos 45 ◦
1
2 1p
2 p^13 p^12b)sin 45 ◦
p
2 12 p^12p 3
1 1
c)tan 30 ◦1
2p 3
1
p^1
2p 3
2
p^1
3
d)tan 60 ◦
p
3
2
p^1
2
p^1
3p
3
11
1
e)cos 45 ◦
p 3
21
2
p^1
3
p^1
2p
2f)tan 30 ◦p^1
21
2p
3
21
1
p^1
3
g)tan 30 ◦p^1
31
2
p^1
2p
3
2p
3
1
h)cos 60 ◦p^1
31
2p
3
2p
3
1
p^1
2
2.Solve forcosin the following triangle, in surd form:55
p
253.Solve fortanin the following triangle, in surd form:6126p
34.Calculate the value of the following without using a calculator:
a) sin 45 °cos 45 ° b)cos 60 °+tan 45 ° c) sin 60 ° cos 60 °Chapter 5. Trigonometry 119