Since i just did a whole blog im not gonna waste any time on this one.
THis blog is going to be about the cos(x+- y) stuff we did and finding exact values of stuff and all that good fun stuff that i love doing so much.
ok so im going to do a problem where you have to find the exact value of sin x
Ex: Find the exact value of sin 75
i think this was on the test but i dont think i did it right lol
You set the problem up as sin(75)= sin(45 + 30)
= sin(45)cos(30) + cos(45)sin(30)
=(s.r. 2/2)(s.r.3/2) + (s.r. 2/2)(1/2) (s.r.= square root)
= (s.r.6/4) + (s.r.2/4)
=(s.r. 6 + s.r. 2) / 4
YAY!! we did it again!! goodbye
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