Question

sin (x-20)=cos(3x-10)​

Answer 1

Step-by-step explanation:

$\ \cos (90 - (x - 20)) = \cos( 3x - 10 ) \\ 90 - x + 20 = 3x - 10 \\ 110 - x = 3x - 10 \\ 110 + 10 = x + 3x \\ 120 = 4x \\ x = 30$

Answer 2

Sin. A = cos (90-A)

Sin(x-20) =cos(3x-10)

Sin(x-20) = sin (90-(3x-10)

Sin(x-20) = sin(100-3x)

x-20 =100-3x

4x =120

X=30°

Sin 10° = cos 80°

Please mark BRAINLIEST