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from crack dat math
1)what is the value of (sin pi/3)(tan-3pi/4) answer is sqrt3/2 i understand sin pi/3 is sqrt 3/2 but how is tan-3pi/4 = 1? i know tan pi/4 is 1.... any help? i'm terrible at trig.
2) cos 7 pi/4 + sin 7 pi/4
don't know how to do this one...
3) cos(pi + 301 pi/2)
they simplify to = pi + 75*2pi + pi/2 then somehow simplify to pi + pi/2=0...but what happened to the 75*2pi? again any help is appreciated!
1)what is the value of (sin pi/3)(tan-3pi/4) answer is sqrt3/2 i understand sin pi/3 is sqrt 3/2 but how is tan-3pi/4 = 1? i know tan pi/4 is 1.... any help? i'm terrible at trig.
2) cos 7 pi/4 + sin 7 pi/4
don't know how to do this one...
3) cos(pi + 301 pi/2)
they simplify to = pi + 75*2pi + pi/2 then somehow simplify to pi + pi/2=0...but what happened to the 75*2pi? again any help is appreciated!