Asked by Chizaram
Sine 15
Cos 75
Tan 105,leaving the answers in surd
Cos 75
Tan 105,leaving the answers in surd
Answers
Answered by
oobleck
use your half-angle and sum-of-angles formulas. and remember that co-sine means sine of complement
sin15° = (√3 - 1)/(2√2)
cos75° = sin15°
tan105° = -√2-√3
sin15° = (√3 - 1)/(2√2)
cos75° = sin15°
tan105° = -√2-√3
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