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OpenStudy (anonymous):
Which of the following statements is true? a. sin 18° = cos 72° b. sin 55° = cos 55° c. sin 72° = cos 18° d. Both a and c.
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OpenStudy (jdoe0001):
http://www.mathportal.org/algebra/trigonometry/trigonometric-formula_files/image014.gif
OpenStudy (anonymous):
oh so i do (90-8x) and (90-16x)?
OpenStudy (anonymous):
i just filled in the blanks you gave me for the formula lol
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