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Use x=4cos θ to

a)write as a trigonometric equation of θ, where 0<θ<π and x<0.

2√2=4sin θ

2√2=4(sin2θ)

2√2=4(sin θ+cos θ)

2√2=sin 2θ-cos2θ

b)Find sin θ.

-√3/2

-√2/2

√2/2

√3/2

c)Find cos θ.

-√3/2

-√2/2

√2/2

√3/2

Correct!