SOLUTION: Evaluate without using a calculator.
sin θ, if cos θ = 2/5 and tan θ < 0. Thank you so much!!
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Trigonometry-basics
-> SOLUTION: Evaluate without using a calculator.
sin θ, if cos θ = 2/5 and tan θ < 0. Thank you so much!!
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sin θ, if cos θ = 2/5 and tan θ < 0.
Only in quadrant IV cosθ>0 and tanθ>0.
This means in quadrant IV, sinθ <0 =√21/5
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