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Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 3 - No. 37)

What type of trigonometry is combined with Pythagoras' theorem in the cosine rule?
Non-right-angled trigonometry
Right-angled trigonometry
Spherical trigonometry
Complex trigonometry

توضيح

The cosine rule combines right-angled trigonometry with Pythagoras' theorem.

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