a) Use de Moivre”s formula to to find Cartesian form of the complex number (-2+2isqrt(3))^5
b) Use Formula cos Î¸= 1/2 (e^i^Î¸ + e^-i^Î¸) to obtain the identity
cos^5 Î¸=1/16(cos5 Î¸+5cos3 Î¸+10cos Î¸)
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