Verify Countersign Formula with airSlate SignNow

Verify countersign formula

via transformations that cosine of PI halves minus X is equal to sine of X right that's how I taught it and so when I told you guys how to memorize those cofunction identities I said guys if you're gonna transform the cosine graph the only graph that can look like is the sine graph agreed but then it kind of confused me because I gave you guys the quiz and I gave you the cofunction identity of secant and you guys did not write cosecant so obviously you did sink into everybody but again like these are just transformations of a graph so of course cosine transformed is only gonna look like sine but now that we know the sum and difference formulas we could also verify it that way right because they got verifying is make the left side look like the right side we're not gonna distribute a grade don't distribute we haven't done that yet agreed I already warned you against not doing it so if you see the addition or subtraction of angles right obviously you can just use the cofunction identity but we're gonna use these we're gonna use this sum the difference formula to show that the left side is equal to the right side so am i using that formula I'll have cosine PI halves times the cosine of X notice it's not negative x right remember I talked to you guys about u minus V you're plugging in U and V not negative V agree so don't make that mistake a lot of people forget about that plus sine of Pi offs times sine of X all right well cosine of PI halves is laughs zero good times cosine of X plus sine of Pi ops is one well zero times cosine is zero one time sine is sine of X yeah those formulas do work right and that cofunction identity is true cosine is sine cosine of that cofunction I did let's give you sign okay I do not prefer to memorize it that way I prefer to look at the transformations in the graph but that is something that I do want you guys to be aware