Asked by Christy
Use sum and difference identitites to find the exact value of co 15 degrees
Answers
Answered by
bobpursley
Cos(15)=cos(45-30)=cos45cos30-sin45sin30
you should have committed all those to memory.
you should have committed all those to memory.
Answered by
Steve
15 = 45-30
cos15 = cos45cos30 + sin45sin30
= 1/√2 * √3/2 + 1/√2 * 1/2
= (√3-1) / 2√2
cos15 = cos45cos30 + sin45sin30
= 1/√2 * √3/2 + 1/√2 * 1/2
= (√3-1) / 2√2
Answered by
Steve
oops that's (√3+1) / 2√2
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