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d/dx(tan^2(x)) is not a known differential, and therefore requires a substitution to calculate it using simpler known differentials.

Using the identity sin^2(x) + cos^2(x) = 1, the equation can be ...

We have, from the formula book, sin⁡(A±B)=sinAcosB±cosAsinB Using A=B=θ, we have sinθ+θ=sinθcosθ+cosθsinθ Which we can simplify to sin2θ=2sinθcosθ as required. We can t...

Receptors detect and sense changes in their surroundings, called stimuli, e.g. a light receptor.
Effectors produce the response to the stimulus, e.g. a muscle.

These questions should be easy mark gainers as they don't usually require a lot of prior knowledge. However, many students find that they consistently lose all their marks on these questions. With many ex...

I definitely recommed watching with subtitles in the target language. Even if you don't understand everything it is a really good way to recognise vocabulary and improve your accent for certain words.