NZ Level 8 (NZC) Level 3 (NCEA) [In development]
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Pythagorean Identities

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
Approx a minute
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Consider the statement: $\sin^2\left(\theta\right)+\cos^2\left(\theta\right)=2$sin2(θ)+cos2(θ)=2

Is the statement possible or impossible?

Which of the following options correctly completes the identity?

$\tan^2\left(x\right)+1=\editable{}$tan2(x)+1=

Which of the following options correctly completes the identity?

$1=\editable{}$1=

Outcomes

M8-6

Manipulate trigonometric expressions

91575

Apply trigonometric methods in solving problems

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