If sinθ= 4/5 in quadrant II, what is cosθ?
2 answers:
Answer:
cos theta = -3/5
Step-by-step explanation:
Answer:
<u>Step-by-step explanation:</u>
<u>Step 1:</u> Use Pythagorean Theorem: x² + y² = r² to find the x-value
x² + 4² = 5²
x² + 16 = 25
x² = 9
x = 3
<u>Step 2:</u> Use the Quadrant to determine the sign of the x-value
Quadrant II Quadrant I
(--, +) (+, +)
Quadrant III Quadrant IV
(--, --) (+, --)
<em>x is negative in Quadrant II</em>
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