If 0<=x<=pi, and sin 2x+2 = 1, then x= ?

Question

Hi, please help me on this problem and explain how you got it! Thank you.

Answer 1

Ummmm....

 

 

Is it  sin(2x+2) = 1 or sin(2x) +2 = 1

 

In the former case, the sine function is 1 when the angle is 90 degrees.

So 2x+2 = 90

    2x = 88

    x = 44

 

 

On the other hand, in the latter case, it is

sin(2x)+2 = 1

sin(2x) = -1

 

The sine function is -1 when the angle is 270 degrees.

So 2x = 270

 x = 135

 

 

2 different answers depending on the parenthesis, so as

to determine whether the +2 is part of the sine argument or not.

 

Please repost