Expression 7: "y" equals "x" tangent left parenthesis, "a" times StartFraction, pi Over 180 , EndFraction , right parenthesis left brace, 0 less than or equal to "x" less than or equal to negative 2sin left parenthesis, "a" times StartFraction, pi Over 180 , EndFraction , right parenthesis cos left parenthesis, "a" times StartFraction, pi Over 180 , EndFraction , right parenthesis , right brace Has graph.y=xtana·π1800≤x≤−2sina·π180cosa·π180
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Gravity perpendicular to the road
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Expression 9: "y" equals "x" tangent left parenthesis, left parenthesis, "a" minus 90 , right parenthesis times StartFraction, pi Over 180 , EndFraction , right parenthesis left brace, 0 less than or equal to "x" less than or equal to 2cos left parenthesis, "a" times StartFraction, pi Over 180 , EndFraction , right parenthesis sin left parenthesis, "a" times StartFraction, pi Over 180 , EndFraction , right parenthesis , right brace Has graph. To audio trace, press ALT+T.y=xtana−90·π1800≤x≤2cosa·π180sina·π180
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Expression 10: "y" equals "x" tangent left parenthesis, left parenthesis, "a" minus 90 , right parenthesis times StartFraction, pi Over 180 , EndFraction , right parenthesis left brace, 2cos left parenthesis, "a" times StartFraction, pi Over 180 , EndFraction , right parenthesis sin left parenthesis, "a" times StartFraction, pi Over 180 , EndFraction , right parenthesis less than or equal to "x" less than or equal to 0 , right brace Has graph.y=xtana−90·π1802cosa·π180sina·π180≤x≤0
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Gravity
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Expression 12: "x" equals 0 left brace, negative 2 less than or equal to "y" less than or equal to 0 , right brace Has graph. To audio trace, press ALT+T.x=0−2≤y≤0