Channel: Krista King

Category: Education

Tags: trigonometric identitiesproving equationshow toeducationalprecalculustrigonometrykrista kingtrigdouble-angle identitiescalculustrig identitiesdouble-angleproofsprecalc

Description: ► My Trigonometry course: kristakingmath.com/trigonometry-course There are so many different kinds of trigonometric identities; double-angle identities are just one kind. Their purpose is to take the "double angle" inside a trig function, and transform the expression into a "regular" angle. Oftentimes, we'll be asked to prove an equation using trig identities. In that case, our goal is to show that the left side of the equation is the same as the right side of the equation. Trig identities allow us to manipulate and rewrite each side of the equation in different ways (without changing the actual value of the equation), until we get to a point where we can see that the sides are in fact equal to one another. ● ● ● GET EXTRA HELP ● ● ● If you could use some extra help with your math class, then check out Krista’s website // kristakingmath.com ● ● ● CONNECT WITH KRISTA ● ● ● Hi, I’m Krista! I make math courses to keep you from banging your head against the wall. ;) Math class was always so frustrating for me. I’d go to a class, spend hours on homework, and three days later have an “Ah-ha!” moment about how the problems worked that could have slashed my homework time in half. I’d think, “WHY didn’t my teacher just tell me this in the first place?!” So I started tutoring to keep other people out of the same aggravating, time-sucking cycle. Since then, I’ve recorded tons of videos and written out cheat-sheet style notes and formula sheets to help every math student—from basic middle school classes to advanced college calculus—figure out what’s going on, understand the important concepts, and pass their classes, once and for all. Interested in getting help? Learn more here: kristakingmath.com FACEBOOK // facebook.com/KristaKingMath TWITTER // twitter.com/KristaKingMath INSTAGRAM // instagram.com/kristakingmath PINTEREST // pinterest.com/KristaKingMath GOOGLE+ // plus.google.com/+Integralcalc QUORA // quora.com/profile/Krista-King