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Solve the trigonometric equation:
Restriction for the solution:
Square both sides of
(i):
Let
So the equation becomes
Solving the quadratic equation:
You can discard the negative value for
t. So the solution for
(ii) is
Substitute back for
t = sin x. Remember the restriction for
x:
where
k is an integer.
I hope this helps. =)
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25/45 you divide by 5 (5/9)
15/27 you divide by 3 (5/9)