Question

11. (a) Find x and y, if x []+y(-1- 1391
con el
(b) If A = [-sine
COS
sin 20
then prove that A =
cos 28
- sin 28
cos 2a!
(2)​

Answer 1

Answer:

The equation sin x = cos x can also be solved by dividing through by cos x. If we put k = 0 and k = 1 we get the solutions /4 (45°) and /4 + = 5 /4 (45°+ 180°= 225°).