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help with math problem?

the problem is this:

Find the exact value: sin 105 *15

I use the product to sum ID to get [1+({sq. rt. 3}/ 2)]/2 I think i typed that out right.

anyway I looked at the answer and saw that, out of that, they obtained (2+ sq. rt. 3)/4

how did they get that?

1 Answer

Relevance
  • ?
    Lv 7
    10 years ago
    Favorite Answer

    (1 + √3/2)/2

    (2 * 1/2 + √3/2)/2

    (1/2)(2 + √3)/2

    (2 + √3)/4

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