SOLUTION: if sin 21 degree = x/y, then sec 21 degree - sin 69 degree is equal to ?
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Question 983552: if sin 21 degree = x/y, then sec 21 degree - sin 69 degree is equal to ?
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
if sin 21 degree = x/y, then sec 21 degree - sin 69 degree is equal to ?
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sec = 1/cos
sin(69) = cos(21)
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sec 21 degree - sin 69 degree
= 1/cos(21) - cos(21)
= (1 - cos^2(21))/cos(21)
= sin^2(21)/cos(21)
=
=
=
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