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

Question 1103551: if sin(a)=0.35 and cos(a)<0 then,
cos(a)=
sin(2a)=
cos(2a)=
tan(2a)=
Answer by Alan3354(69443) (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
===============
sin(2A) = 2sin(A)cos(A)
cos(2A) = sqrt(1 - sin^2(2A))
tan(2A) = sin(2A)/cos(2A)

RELATED QUESTIONS
If ∠A is ACUTE and cos A = 4/5 find sin A, cos 2A, sin 2A, and tan... (answered by ikleyn)

Cos 2A + 1/Cot A = Sin... (answered by Alan3354)

simplify... (answered by Alan3354)