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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....

but i do have an idea how to do it......but it's brute force.....is there a shorter way?

my idea is using sin (2x) over and over

nice!
lets see how new learners try it... maybe they don't even know that e^{ix} identity

I do know that formula made by Euler, but I didn't know we could apply that here. :P

u can try it parth....
maybe @mathslover also wanna try this....

Here is an example of using Euler's formula to show that:\[\cos(2x)=\cos^2(x)-\sin^2(x)\]\[\sin(2x)=2\sin(x)\cos(x)\]

Yeah , it is great to see the new pattern :
@hartnn can you explain how to do it?