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- Oct 11, 2018
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- HSC
- 2019
a) Determine the roots of z^4 + 1 = 0 in cartesian form. Plot them on an Argand diagram.
b) Write z^4 + 1 in terms of real quadratic factors/
c) Divide by z^2 to show that cos(2x) = (cos(x) - cos(45)(cos(x) - cos(135))
Need help with part (c) thanks
b) Write z^4 + 1 in terms of real quadratic factors/
c) Divide by z^2 to show that cos(2x) = (cos(x) - cos(45)(cos(x) - cos(135))
Need help with part (c) thanks