10.02 Cofunction identities
Interactive practice questions
Consider the following image to investigate the trigonometric ratios $\sin\theta$sinθ and $\cos\left(90^\circ-\theta\right)$cos(90°−θ)
a
$\sin\theta$sinθ = $\editable{}$
$\cos\left(90^\circ-\theta\right)$cos(90°−θ) = $\editable{}$
b
Does $\sin\theta=\cos\left(90^\circ-\theta\right)$sinθ=cos(90°−θ) for all values of $\theta$θ less than 90°?
Yes
A
No
B
Easy
1min
Consider the following image to investigate the trigonometric ratios $\cos\theta$cosθ and $\sin\left(90^\circ-\theta\right)$sin(90°−θ)
Easy
1min
Fill in the blank with the acute angle that makes the statement true.
Easy
< 1min
Complete the blank in the following expression:
Easy
< 1min
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