Question 137

If sinθ = 0.7, then cos θ, 0 ≤ θ < 90°, is

Solution

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Given that : sinθ = 0.7

we know that : $$sin^2 \theta + cos^2 \theta$$ = 1

$$cos^2 \theta$$ = 1 - $$0.7^2$$ = 1 - 0.49 = 0.51

$$cos \theta$$ = $$\surd 0.51$$

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