Trigonometry: Addition Formulas
Sol 1
Sol 2
Sol 3
Sol 4 .
Sol 5 .
Sol 6
Sol 7 .
Sol 8 Let be the angle between the first line and the positive
x-axis, and let be the angle between the second line and the positive
x-axis. Then the angle between the two lines is given by
, and
and
; so
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