Question

would 1 - 2cos^2(y) = 2sin^2(y) ?????

Answer 1

2 - 2cos^2(y) = 2sin^2(y)

Answer 2

learning trig for the first time?

Answer 3

^^

Answer 4

ITS NOT

Answer 5

Sorry. sin^2x + cos^2x = 1. So, 1-2cos^2x can't equal 2sin^2x.

Answer 6

nope, just got confused. Butt: wouldn't the example which I gave form the equation that:

2sin^2x + 2cos^2x = 1,

therefore sin^2x + cos^2x = 1/2 ????

Answer 7

\( 1 - 2 \cos^2(y) = - \cos 2y \)

Answer 8

thats equal to 2

Answer 9

shinigami1m - sorry. I mis-read it first as 2 - 2cos^2x = 2sin^2x.

Answer 10

yeahhh, that's what I was confused about. So help me solve this:

2cs^2y - siny - 1 = 0.

Answer 11

cos or csc?

Answer 12

cos^2y = 1-sin^2y. Substitute. You get a quadratic equation in siny. Then solve.

Answer 13

sorry, cos, not cosec.

^Okayy, so lemme try that and see.

Answer 14

s^2 + c^2 = 1

2s^2 + 2c^2 = 2 is what im thinking

Answer 15

gotta use rads ;)

Answer 16

WHAT IS THIS :O

Answer 17

YOU FACE, SHAL'S. Finally rediscovered, after what: a million years??? :P

Answer 18

I think this method might work:

1 - 2 cos square y = 2 sin square y(Given)
Or, 1 = 2 sin square y + 2 cos square y
Or, 1 = 2(sin square y + cos square y)
We get, 1 = 2 (Impossible!!!!)

Answer 19

Sometimes the question may be wrong.