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Showing posts with label cos15°. Show all posts
Showing posts with label cos15°. Show all posts

Wednesday, April 15, 2009

exact values of certain trigonometric ratio

exact values of certain trigonometric ratio for 7½ ° , 15° , 18° ,22½° , 36° , 54°,72°,75°proof of exact value of tan[22½ °] or tan (pi / 8 )

exact value of tan15° without using calculator



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