Question

answer it plz immmediately​

Answer 1

Answer:

x = 80°

Step-by-step explanation:

We know the formula

1.) cosx = sin(90°-x)

So, as cos(40°-x) = sin30°, then we can write

sin{90°-(40°+x} = sin30° [ using formula 1.) ]

sin(50°-x) = sin30°

Comparing both sides, we can write that

50°-x = 30°

=> 50° + 30° = x

=> x = 80°