sin^2 10°+sin^2 80°+sin 15°cos 75°+cos 15°sin 75°/cos theta sin( 90°-theta)+sin theta cos(90°- theta)
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sin2(90-80)+sin2 80+sin(90-75)cos 75+cos(90-75)sin 75/cos theta cos theta +sin theta sin theta
cos2 80+sin2 80+cos 75 cos 75+sin 75 sin 75/cos2 theta +sin2 theta
1+cos2 75+ sin2 75/1
1+1/1
2/1
2
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