8. Circular Functions
Interactive practice questions
Find the exact value of $\sin^2\left(20^\circ\right)+\cos^2\left(20^\circ\right)$sin2(20°)+cos2(20°).
Easy
1min
Find the exact value of $\sin^2\left(\frac{\pi}{5}\right)+\cos^2\left(\frac{\pi}{5}\right)$sin2(π5)+cos2(π5).
Easy
< 1min
Given that $\cos x=\frac{12}{13}$cosx=1213 where $x$x is in the first quadrant, answer the following questions.
Easy
3min
Given that $\sin\theta=\frac{\sqrt{3}}{2}$sinθ=√32 for $90^\circ<\theta<180^\circ$90°<θ<180°, find the value of $\cos\theta$cosθ using the Pythagorean identity.
Easy
2min
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