if x=cos theta-3 sin theta Y=2cos theta +3sin theta then tan theta=
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X=cos-3sin - 1
Y=2cos +3sin -2
adding 1&2
X+Y=cos-3sin+2cos+3sin
X+Y=3Cos
cos=X+Y/3
multiply 1 × 2
2X=2cos-6sin-3
Sub 2&3
2cos+3sin-2cos+6sin=Y-2X
sin=Y-2X/9
tan=y-2X/9×3/X+Y
tan =Y-2X/3X+3Y
Y=2cos +3sin -2
adding 1&2
X+Y=cos-3sin+2cos+3sin
X+Y=3Cos
cos=X+Y/3
multiply 1 × 2
2X=2cos-6sin-3
Sub 2&3
2cos+3sin-2cos+6sin=Y-2X
sin=Y-2X/9
tan=y-2X/9×3/X+Y
tan =Y-2X/3X+3Y
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