OpenStudy (anonymous):

How would you solve these? i've gotten up to 2tanx+1-tan^2 x=0 for the first one but i don't know what else to do. sin2x+cos2x=0 3sinx=1+cos2x sqrt { 2 } sinx= cot x

OpenStudy (unklerhaukus):

let tan x = z tan^2 x = z^2 solve the quadratic

OpenStudy (anonymous):

oh thanks, but how abt the other ones?

OpenStudy (unklerhaukus):

for the second one use cos(2u)= 1 − 2 sin^2(u)