# How my query should looks like ?

Posted 3 years ago
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 Hello, I have a challenge I'm not sure how to express it. here is the original question: "From the formula for sin (2t + t) find sin 3t in terms of sin t." The answer is -4 sin^3 (t) + 3sin (t)Any help with on how the query should looks like.Thank you ahead Tal
 Hi Tal, the function you are looking for is probably TrigExpand, TrigExpand[Sin[3t]]