INTRODUCTION TODIGITALFILTERS WITHAUDIOAPPLICATIONS

1.2 Complex and Trigonometric Identities 254. 1.2.1 Complex Numbers 255. 1.2.2 The Exponential Function 256. 1.2.3 Trigonometric Identities 257. 1.2.3.1 Trigonometric Identities, Continued 257. 1.2.4 Half-Angle Tangent Identities 258. 1.3 A Sum of Sinusoids at the Same Frequency is Another Sinusoid at that Frequency 258. 1.3.1 Proof Using ... ................
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