AM-921

Double angle formulae

A Math · Secondary 3 · Hard · Double angle formulae

1. $-\dfrac{119}{169}$
2. $\dfrac{119}{169}$
3. $-\dfrac{25}{169}$
4. $-\dfrac{144}{169}$

Sign in to check your answer and see the hint and the worked explanation. Free on PrepLab High.