Trigonometry- Evaluate using half angle formula (STEP BY STEP) part 1 

Hello guys!!! In this video, we use the half angle formula for sine in order to evaluate sin(112.5 deg). We must understand how to determine what angle on the unit circle we will use when evaluating sin(112.5°). One of the key parts of this formula is knowing what to plug in for θ when evaluating the half angle. The way we do this is we have to set θ/2=112.5° in this case and then use whatever θ equals to plug it into the half angle formula. Also keep in mind what quadrant this angle lies in since that is used to determine what sign to use for the square root. I will be making more videos on how to find the cos(112.5) as well as tan(112.5) using half-angle formulas so please do stay tuned for that! If you did not see the previous video, please do so! Link is down below :). With that being said, THANK YOU FOR WATCHING!!! PLEASE LIKE, COMMENT, AND/OR SUBSCRIBE!!! Thanks guys :)
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