Question

MEDAL AND FAN FROM TWO ACCOUNTS PLEASE PLEASE PLEASE HELP
Find all solutions to the equation.
7 sin2x - 14 sin x + 2 = -5

Answer 1

let sinx=y
\[7y ^{2}-14y+2=-5\]
\[7y ^{2}-14y+7=0\]
divide evrything by 7 to simplify
\[y ^{2}-2y+1=0\]
Factor
\[(y-1)(y-1)=0\]
y-1=0
y=1

sinx=y=1
sinx=1

Answer 2

\[x=\sin ^{-1}1=90\]

Answer 3

@Mokeira Thats the only answer? 90 deg?

Answer 4

That is my answer