Question

sin^2(y) + 2sinycosy = 0.

What do I do?? do i turn 2sinycosy to sin2y?? but how will that help?? :P

Answer 1

@hartnn heeelp :P

Answer 2

can't u take sin x common ?

Answer 3

sin2y won't help

Answer 4

sin y (sin y+2 cos y)=0

Answer 5

factor out sin(y)
then you have
sin(y) ( sin(y) +2 cos(y)) =0
that means either sin(y)=0
or sin(y)+2cos(y)=0
this last one can be changed into a tan(y)

Answer 6

yeahh, i thought of that :P but then what??

Answer 7

HOLD UP how??

Answer 8

@phi explained

Answer 9

divide by cos(y)

Answer 10

how for which part ?

Answer 11

oh waitt, i think i got it :P

Answer 12

lemme put in the answers in a few, tell me if its right :P same domain tho, btw.

Answer 13

so i got 0, 180, 360, 116.57, 296.57?? :P thankss, guys :)

Answer 14

yup, even i got that.

Answer 15

AHA i feel so ishmaaart. shmarty-pantsh.

Answer 16

lol! u are :)

Answer 17

heyy, can you come to this question?? i need some help explaining this thing :P http://openstudy.com/study#/updates/50645c64e4b0583d5cd3c53c