Use the following values to answer the questions:
sin 37°=0.6, cos 37°=0.8, and sin 27°=0.45
1. Express sin 64° in terms of 27° and 37°. Do not evaluate.
2. Calculate cos 27° to one decimal place and use it to find cos 10°.
3. Calculate sin 74° using a double angle formula.
sin 37°=0.6, cos 37°=0.8, and sin 27°=0.45
1. Express sin 64° in terms of 27° and 37°. Do not evaluate.
2. Calculate cos 27° to one decimal place and use it to find cos 10°.
3. Calculate sin 74° using a double angle formula.
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1) 64 = 27 + 37
2) cos27 = sqrt(1 - 0.45^2)
3) sin(74) = sin(2*37) = 2sin37cos37
2) cos27 = sqrt(1 - 0.45^2)
3) sin(74) = sin(2*37) = 2sin37cos37
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