Optional Mathematics, Class 10: Trigonometry
Submultiple Angles
A/2 and A/3 · sin A, cos A, tan A · Worked proofs
By the end of this lesson you can
📐Say what a submultiple angle is and give examples
✏️Write sin A, cos A and tan A in terms of A/2
🔺Write sin A, cos A and tan A in terms of A/3
🧮Find values such as sin 15° and prove identities
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Cut an angle A into 2, 3, 4 equal parts. Each part, A/2, A/3, A/4, is a submultiple angle of A.