Question

PRECALC HELP!
Find all solutions in the interval [0,2pi]
sin2(theta) - cos(theta) = 0

Answer 1

convert everything to cosines by using the identity sin^2 theta = 1 - cos^2 theta

Answer 2

How though? Like the 2 is not an exponent, its just a solid number

Answer 3

Oh ok I misread the question

theres another identity u can use

sin 2theta = 2 sin theta cos theta

Answer 4

So change the sin2theta to that?

Answer 5

yes

Answer 6

then you#ll find you can factor

Answer 7

Would I take out cos?

Answer 8

cos theta yes

Answer 9

then you can use the product = 0 rule.

Answer 10

So in the parentheses it would just be 2sin theta?

Answer 11

- and a number

Answer 12

Oh! -1?