If you've learnt sin(A+B) = sinAcosB + cosAsinB,sin(4u)= sin(2u+2u)= sin(2u)cos(2u) + cos(2u)sin(2u)...

Mathematics, 12.03.2021 21:20 rileyallen4186pd5tgy

Sin4u=2sin 2u cos 2u

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Sin4u=2sin 2u cos 2u...

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Sin4u=2sin 2u cos 2u​

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Sin4u=2sin 2u cos 2u