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Homework Statement
a) 2sin3x=sqrt(2).
Find Theta.
b) Cos4x=1/2. Find Theta
Homework Equations
The Attempt at a Solution
a) sin3x=1/sqrt(2)
Theta=pi/4. This is from the 45-45-90 triangle.
Also Theta=3pi/4. How did they get this one? Can you guess it without looking at the graph of the sine function?
b) 4x=1/2=pi/3=theta. From 30-60-90 triangle.
But theta also equals 5pi/3. Again, How can we guess the other angle( 5pi/3) without looking at the graph of the cosine function? Thanks.