Question

sin 4x = cos 5x therefore x = ?
​

Answer 1

Answer:

see the above attachment my frnd

Answer 2

Step-by-step explanation:

sin 4x = cos 5x

sin 4x = sin (90°-5x) [ #cos x = sin(90°-x) ]

therefore 4x = 90°-5x

4x + 5x = 90°

9x = 90°

x = 90°/9

x = 10°