SOLUTION: if sin(a)=0.35 and cos(a)<0 then, cos(a)= sin(2a)= cos(2a)= tan(2a)=

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Question 1103551: if sin(a)=0.35 and cos(a)<0 then,
cos(a)=
sin(2a)=
cos(2a)=
tan(2a)=
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
if sin(a)=0.35 and cos(a)<0 then,
sin(A) = 7/20 = y/r
cos(A) < 0 --> Q2
cos(A) = sqrt(1 - sin^2) = sqrt(351/400) = -3sqrt(39)/20
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sin(2A) = 2sin(A)cos(A)
cos(2A) = sqrt(1 - sin^2(2A))
tan(2A) = sin(2A)/cos(2A)