Find F_2 and its direction angles, then find the direction angles of F_1

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The two forces F1 and F2 acting at A have a resultant
force of FR = 5-100k6 lb. Determine the magnitude and
coordinate direction angles of F2.

Determine the coordinate direction angles of the
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Thank you you gave me homework to send the teacher

yuttasartjuvan
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Shouldn't the z component be 60* -sin50 because its in the -z axis

Momo-gxvd
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why is cosine 50 used to find the projection of Fxy. Is there a case when sine function is used?

akilrampersad