Question #139912
Rewrite each expression as a single trigonometric ratio, and then evaluate the ratio ( show full work )

1a) tan 170• - tan 110• / 1+ tan 170• tan 110•

b) cos 5pie/12 x cos pie over 12 + sin 5pie over 12 x sin pie over 12
1
Expert's answer
2020-10-28T18:47:02-0400

(tan(a) - tan(b))/(1+ tan(a)*tan(b)) = tan(a-b)


(tan(170o) - tan(110o))/(1+ tan(170o)*tan(110o)) = tan(170o-110o) = tan(60o) = sin(60o)/cos(60o) = 3\sqrt{3}


cos(a)*cos(b) + sin(a)*sin(b) = cos(a-b)


cos(5π\pi/12)*cos(π\pi/12) + sin(5π\pi/12)*sin(π\pi/12) = cos(5π\pi/12 - π\pi/12) = cos(4π\pi/12) = cos(π\pi/3) = 1/2


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