Asked by Aliya
What is the value of cos225+sin165
Answers
Answered by
oobleck
that would be the same as
-cos45 + sin15
= -1/√2 + (√3-1)/2√2 = (-2+√3-1)/(2√2) = 1/2 (√3-3)/√2 = 1/4 (√6-3√2)
-cos45 + sin15
= -1/√2 + (√3-1)/2√2 = (-2+√3-1)/(2√2) = 1/2 (√3-3)/√2 = 1/4 (√6-3√2)
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