Question

Type the correct answer in the box bellow: ( ??? ).

If cos x = sin(20 + x)° and 0° < x < 90°, the value of x is ( ??? )°.

Answer 1

Answer:

35 degrees

Step-by-step explanation:

$cos x = sin(20+x)\\\\sin(90-x) = sin (20+x)\\\\Comparing,\\90-x = 20 +x\\70 = 2x\\x= 35$