IB skill practice

Use compound angle identities in proof

Apply compound angle identities to prove and simplify trigonometric statements.

Paper 1, Paper 2 5 marks Difficulty 3

Use compound angle identities in proof - identity selection

For acute angles \(A\) and \(B\), \(\sin A=7/25\), \(\cos A=24/25\), \(\sin B=3/5\), and \(\cos B=4/5\). Enter \(\sin(A+B)\).

Worked practice: result and interpretation

Calculate the requested result first, then choose the interpretation that follows from it.