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A p p e n d i x<br />

MATHEMATICAL TECHNIQUES,<br />

IDENTITIES, AND TABLES<br />

A–1 TRIGONOMETRY AND COMPLEX NUMBERS<br />

Definitions<br />

sinx = ejx -e -jx<br />

2j<br />

cos x = ejx + e -jx<br />

2<br />

tan x = sin x<br />

cos x =<br />

e jx - e -jx<br />

j(e jx + e -jx )<br />

Trigonometric Identities and Complex Numbers<br />

e ;jx = cos x ; j sin x (Euler’s theorem)<br />

669

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