Use a co-terminal angle to find the exact value.
sin405

Question

Use a co-terminal angle to find the exact value.
sin405

anonymous · Answer

that is sin(405 degrees),  correct?

anonymous · Answer

if so then tell me how many degrees in a full revolution of a circle?

anonymous · Answer

@minisweet4

anonymous · Answer

whatever you find that number to be, subtract that from 405,  so 405 - (degrees in full revolution of circle)

that will give you a co-terminal angle,   so take the sin of the co-terminal angle, make sure to check if sin is positive or negative in that quadrant

anonymous · Answer

I got that part but I dont get why the answer is square root 2/2 when I got a decimal

anonymous · Answer

if you divided sqrt(2) by 2 on a calculator it will give you a decimal approximation,  this is basically what your calculator is doing to get you the decimal answer

anonymous · Answer

So how do I get the decimal answer to sqrt(2) by 2. I didn't know that was the answer until I looked in the back of the book

anonymous · Answer

i would recommend using a calculator, or you can just type it into google search - https://www.google.com/search?q=sqrt(2)%2F2&oq=sqrt(2)%2F2

anonymous · Answer

What I'm saying is that when I first did the problem I got the decimal and I thought thtat was but the answer is sqrt(2) by 2. How did they get the sqrt(2) by 2 from the decimal answer?

anonymous · Answer

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