1. The problem statement, all variables and given/known data I'm doing a statics problem and am following how the solutions manual does it but they skipped a few steps and I'm lost as a result. I have two equations and two unknowns: F and θ (degrees) 2. Relevant equations Equation 1: F*cos(25+θ) = -54.684 Equation 2: F*sin(25+θ) = 69.131 3. The attempt at a solution Solve for F: F=-54.684/cos(25+θ) Plug F into other equation and combine sin and cos to get tangent(25+θ): -54.684*tan(25+θ)=69.131 tan(25+θ)=(-1.26) 25+θ=arctan(-1.26) 25+θ=-51.65 θ=-76.65 The solutions manual simply says "Solving Equations (1) and (2) yields 25+θ=128.35; θ=103 degrees; F = 88.1 lb" The only thing I can think of is adding 180 degrees to the θ I got which gives me the 103 degrees they got. Any ideas?