Pythagorean identities
Trigonometric ratios and identities · Mathematics
Study notes
Q: If sin θ = 3/5 and θ is acute, find cos θ and tan θ. cos²θ = 1 - 9/25 = 16/25. cos θ = 4/5 (positive, acute). tan θ = sin/cos = (3/5)/(4/5) = 3/4.
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Trigonometric ratios and identities · Mathematics
Q: If sin θ = 3/5 and θ is acute, find cos θ and tan θ. cos²θ = 1 - 9/25 = 16/25. cos θ = 4/5 (positive, acute). tan θ = sin/cos = (3/5)/(4/5) = 3/4.