If sin 20 26
where 0 e (45":360"] determine, with the aid of a diagram and
5
without using a calculator the value of sin 0.
(6)
4.2
Simplify without using a calculator:
sin 1040 (2 cos 15" - 1)
lan 38". sin 4120
(6)
4.3
Prove the identity:
1
cos 2.1 + 1
COS 2.1.cosur
(5)
1
cos
2
Determine the solution of:
shr + cos. x = 1, for 0° <!< 360°​