Trigonometric Identities and Equations (HSC SSCE Mathematics Advanced): Quizzes

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Complementary Angle Identities
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What are complementary angles?

Two angles that sum to 90°90°

If one angle is 35°35°, what is its complementary angle?

55°55°

What does sin⁡(90°−θ)\sin(90° - \theta) equal?

cos⁡θ\cos \theta

What does tan⁡(90°−θ)\tan(90° - \theta) equal?

cot⁡θ\cot \theta

Which pair are cofunctions?

Tangent and cotangent

What does the 'co-' prefix in cofunction indicate?

The complementary relationship

In a right-angled triangle, what happens to sides for complementary angles?

Opposite and adjacent sides swap roles

When is the identity tan⁡(90°−θ)=cot⁡θ\tan(90° - \theta) = \cot \theta undefined?

θ=180°n\theta = 180°n where nn is an integer

When is sec⁡(90°−θ)=cosec θ\sec(90° - \theta) = \text{cosec } \theta undefined?

θ=180°n\theta = 180°n where nn is an integer

What is cos⁡(90°−30°)\cos(90° - 30°) equal to?

sin⁡30°\sin 30°

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