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Write down the formulas involving cos2x and select the one which involves only cosine, this is because cosine (or derivations of it) is the only trigonometric function in this question. Substitute the cho...

With distance downstream, the river gains more energy and a higher volume of water (as shown in Bradshaw's Model). Because the channel has increased in size, there is less friction. As the river erodes la...

There are a number of verbs which take etre as the auxiliary verb when forming the perfect tense. These are generally verbs showing movement or a change of state and a useful technique to remember them is...

In German, we have 3 different genders: masculine, feminine and neuter. Most of the time you simply have to learn off by heart which nouns are which gender, however there are some rules which can help. Fo...

In French, the subjunctive is a "mood" (conjugation of a verb) which is used when expressing wish, hope, fear, uncertainty or other attitudes and feelings towards something. You should try to us...