Calculating cross price elasticity of demand

$$Q=0.3L^{-1}M^{\frac{1}{3}}R^\frac{2}{3}Y^{\frac{1}{2}}$$

I'm asked to find both the cross-price elasticity of demand for $$R$$ wrt $$Q$$ ($$1$$) at current prices and cross-price elasticity of demand for $$L$$ wrt $$Q$$ ($$2$$) at current prices. I'm given no constants to substitute for $$L,M,R$$ or $$Y$$.

I'm using the formula CPEoD = $$\frac{dQ}{dR}\frac{R}{Q}$$ to solve the question.

Since everything cancels my answers are:

$$1$$) $$\frac{2}{3}$$

$$2$$) $$-1$$

Is this correct? I'm used to having the variables having substitutable constants and solving for a constant Q rather than this.