Answer:
a) 0.7660
b) 0.1710
c) 0.6428
d) 0
e) 1.4142
f) 1
Explanation:
First is important set up the calculator to mode "degrees", not Radians.
a) sin (50) = 0.766044443, approximate to 4 decimal places, we take the first 4 decimals. So it will be 0.7660
b) 0.5*sin (20) = 0.171010071, approximate to 4 decimal places, we take the first 4 decimals. So it will be 0.1710
c) sin (40) = 0.642787609, approximate to 4 decimal places, we take the first 4 decimals. So it will be 0.6428. In this case, the fifth place is 8 this number is bigger than 5 for that reason the fourth place will change to the next number in this case from 7 to 8.
d) sin (0) = 0 it doesn't apply.
e) 2*sin (45) = 1.414213562 approximate to 4 decimal places, we take the first 4 decimals. So it will be 1.4142.
f) sin (90) = 1 it doesn't apply.
