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individually. 2. The sum and difference identities can be used to find the exact value of trig functions whose ratios we (54) memorized (like
individually. 2. The sum and difference identities can be used to find the exact value of trig functions whose ratios we (54) memorized (like cos 75).
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Advanced Engineering Mathematics
Authors: Erwin Kreyszig
2nd Edition
471889415, 978-0471889410
