Use your calculator to work out $$\frac{\sin 25^{\circ} + \sin 40^{\circ}}{\cos 25^{\circ} - \cos 40^{\circ}}$$ (a) Write down all the figures on your calculator display - Edexcel - GCSE Maths - Question 8 - 2017 - Paper 2

To calculate the expression, we first compute the values of the sine and cosine functions:

• Calculate $\sin 25^{\circ} \approx 0.4226$
• Calculate $\sin 40^{\circ} \approx 0.6428$
• Calculate $\cos 25^{\circ} \approx 0.9063$
• Calculate $\cos 40^{\circ} \approx 0.7660$

Now substitute these values into the expression:

$\frac{0.4226 + 0.6428}{0.9063 - 0.7660} = \frac{1.0654}{0.1403} \approx 7.5962...$

On the calculator display, the result shows 7.5962... before rounding.