Aaah! new group for trigonometry :)
Let me start this by asking to expand sin 5x in powers of sin x.
Only for those who have started learning trigonometry and never tried this.
Those who already know how to, can give other methods, not discussed here, later.

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using the new groups is fun, isn't it?

...i never really learned these stuffs...all i know are the basics of trigonometry....

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