Hello everyone so I have a math test tomorrow and im stuck on a review question. It's trigonometry in a functions class. I was just wondering if anyone would be able to figure it out.
heres the question
1. Given sinx + cosx = 2/3 , calculate the value of sin2x
any help will be appreciated.
The double angle formula states that sin2x = 2*sinx*cosx. That may be helpful along with another trig identity. I suggest memorizing these. If its anything like my highschool trig classes, you will be using them a lot. Many problems can be solved by using a well defined procedure for that given class of problems, combined with a trick. Many students know the procedure but have trouble finding the trick. In this case, I would consider the identities the trick.