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Represent an angle in the second quadrant

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Reference no: EM132059432

Let θ represent an angle in the second quadrant such that sin (θ) = 4/5

a.) What is cos (θ)? (for my answer I got cos (θ) = -3 / 5, but not sure if I'm right)

b.) Find sin (θ / 2) and cos (θ / 2) [hard time with this question]

If you could give step by step help so I can practice this later, I would really appreciate it!

Reference no: EM132059432

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