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Easy: First quadrant
On the unit circle, cos θ is the x-coordinate and sin θ the y-coordinate of the point at angle θ, and tan θ = sin θ ÷ cos θ. Find the reference angle (the acute angle to the x-axis), take its value from 30°, 45° or 60°, then give it the sign of the quadrant: all positive in I, sine in II, tangent in III, cosine in IV.
Find the exact value.
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The acute angle between the terminal side and the x-axis. The trig values of an angle equal those of its reference angle, up to sign.
"All Students Take Calculus": all positive in quadrant I, sine in II, tangent in III, cosine in IV.
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