winfrey32 winfrey32

22-11-2020
Mathematics

contestada

Prove that sin(3x)/sin(x)·cos(x) = 4cos(x)-sec(x)

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gufeliz1965 gufeliz1965

22-11-2020

Here is a huge hint:

sin(3x) = 3 sin (x) - 4(sin x)^3

sec (x) = 1/sin(x)

Take it from here.

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