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p = sin 40 q = cos110 find expression for cos140 and find expression for tan140

Guest Jun 22, 2015

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 #1
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sin(40)=sin(180-40)  or sin(40) = sin(140) = p

 

cos(140) = -√(1-sin(140)2) = -√(1-p2)  Cosine is negative in the 2nd quadrant.

 

tan(140) = sin(140)/cos(140) = -p/√(1-p2)  Tangent is also negative in the 2nd quadrant

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Alan  Jun 23, 2015
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1+0 Answers

 #1
avatar+26329 
+10
Best Answer

sin(40)=sin(180-40)  or sin(40) = sin(140) = p

 

cos(140) = -√(1-sin(140)2) = -√(1-p2)  Cosine is negative in the 2nd quadrant.

 

tan(140) = sin(140)/cos(140) = -p/√(1-p2)  Tangent is also negative in the 2nd quadrant

.

Alan  Jun 23, 2015

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