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OpenStudy (anonymous):
how to expand sin4x
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OpenStudy (freethinker):
try
myininaya (myininaya):
Well the first thing you should notice is 4 is even so you can write 4x as 2(something) this should make you think of what identity?
OpenStudy (freethinker):
if you're not going to try, at least tell us what you don't understand
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