if 5cos - 12 sin = 0, find sin+cos÷2cos- sin
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5cosA-12sinA=0
5cosA=12sinA
tanA=5/12
sinA+cosA
----------------
2cosA-sinA
divide by numerator and denominator by cosA
tanA+1
----------
2-tanA
5/12+1
---------
2-5/12
17/12
-------
19/12
=17/19
5cosA=12sinA
tanA=5/12
sinA+cosA
----------------
2cosA-sinA
divide by numerator and denominator by cosA
tanA+1
----------
2-tanA
5/12+1
---------
2-5/12
17/12
-------
19/12
=17/19
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