Review question

# If $\sin X$ and $\cos Y$ are both negative, what can we say about $X + Y$? Add to your resource collection Remove from your resource collection Add notes to this resource View your notes for this resource

Ref: R7000

## Question

1. Given that $\sin 3z^\circ = k$, where $0 < k < 1$, how many values of $z$ lie between $0$ and $360$?

2. Given that $X$ and $Y$ both lie between $0$ and $360$, and that $\sin X^\circ$ and $\cos Y^\circ$ are both negative, find the values between which $X + Y$ must lie.