Eric Nicholas K's answer to Ashley Ong's Secondary 4 A Maths Singapore question.
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A good technique to approach these proving questions is to use identities where possible, especially the identity tan x = sin x / cos x. Dealing with the expressions in sin x and cos x keeps expressions simple to calculate. Techniques of factorisation are also important here.
Date Posted:
5 years ago
I mean, the techniques are important in other questions.