Question

simplify sin(30+x)+cos(60+x)

I can't find any identity that is related to this?

Answer 1

ummm looks familiar though

Answer 2

sin (A + B) = (sin A)(cos B) + (cos A)(sin B)

sin (A - B) = (sin A)(cos B) - (cos A)(sin B)

tan (A + B) = (tan A + tan B)/(1 - (tan A)(tan B))

tan (A - B) = (tan A - tan B)/(1 + (tan A)(tan B))

Answer 3

first find X then plug into a scientific calculator: sin(30+_) + cos(60+_), then you get you answer!

Answer 4

how do I find x?

Answer 5

http://www.pleacher.com/mp/mgifs/gifs1/sumdif.gif

Answer 6

let's split this up for a bit...

Answer 7

well, your will be in terms of "x"

Answer 8

well, your will be in terms of "x"
^
answer =)

Answer 9

most likely by grouping like terms, so x=_+_

Answer 10

sin(30+x)+cos(60+x)
since we have a + in sin
sin (A + B) = (sin A)(cos B) + (cos A)(sin B)
so a = 30 and b = x
MOreover... we have a + in cos

cosacosb-sinasinb where a = 60 and b = x

Answer 11

sin(30+x)+cos(60+x)

sin(30+x) =sin30cosx+cos30sinx
cos(60+x) = cos60cosx+sin60sinx

Answer 12

sorry I'm having trouble reading this... *zooms in*

Answer 13

sin30cosx+cos30sinx + cos60cosx+sin60sinx
o_O

Answer 14

how does that help though? doesnt it make it more confusin? or do I convert sin30 into the trig ratios?