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Use the double angle formulae and the identity cos(A+B)≡cos(A)cos(B)−sin(A)sin(B) to obtain an expression for cos 3x in terms of cos x only

To answer, you need to know and be able to use your trigonometric formulae including the double angle formulae on data sheet. 1: cos(3x)=cos(2x+x) = cos(2x)cos(x) - sin(2x)sin(x) split the 3x into two terms,...
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Answered by Sam H. • Maths tutor
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What is the difference between independent measures design and repeated measures design?

An independent measures design consists of using different participants for each condition of the experiment. The advantage of this is that there are no order effects, which is when participants behave diffe...
CC
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What were the causes of the 1917 Russian Revolution?

1905 saw Bloody Sunday occur when Tsarist Russian Imperial forces massacred protestors angry with famine and feudalism. This resentment continued to fester until February 1917 when in amidst of famine, infla...
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Answered by Labeeb H. • History tutor
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Outline the learning model of addiction

The initiation of addictive behaviour can be explained by social learning theory. For example, smoking addiction can be the result of influence from role models or peers, via vicarious reinforcement. This is...
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What is the difference between epistemic and deontic modal auxiliary verbs?

A modal auxillary verb is verb such as 'must', 'will', 'should', 'may', 'might' and so on, that indicate something that may or may not happen in a sentence. Whether or not the verb is epistemic or deontic in...
EO
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