Maths-
General
Easy

Question

The points of contact of the vertical tangents to x equals 2 minus 3 blank s i n blank theta comma y equals 3 plus 2 blank c o s blank theta are

  1. (2,5), (2,1)    
  2. (-1,3), (5,3)    
  3. (2,5)(5,3)    
  4. (-1,3)(2,1)    

hintHint:

A normal in geometry is a piece of geometry that is perpendicular to another piece of geometry, such as a line, ray, or vector. For instance, the (infinite) line perpendicular to the tangent line to the curve at the point is the normal line to a plane curve at the point. Here we have to find the points of contact of the vertical tangents to x equals 2 minus 3 blank s i n blank theta comma y equals 3 plus 2 blank c o s blank theta.

The correct answer is: (-1,3), (5,3)


    At a specific point on a curve, tangents and normals behave just like any other straight lines. The normal runs perpendicular to the curve, and a tangent is parallel to the curve at the point. Like any other straight line, the equation of tangent and normal can be evaluated.
    Here we have given equations as x equals 2 minus 3 blank s i n blank theta comma y equals 3 plus 2 blank c o s blank theta.

    N o w space f o r space t h e space v e r t i c a l space tan g e n t s comma space w e space h a v e colon
fraction numerator d x over denominator d theta end fraction equals 0 comma
s o space w i t h space t h i s space w e space g e t colon
minus 3 cos theta equals 0
theta equals straight pi over 2 o r space fraction numerator 3 straight pi over denominator 2 end fraction
N o w space w e space h a v e space t h e space c o r r e s p o n d i n g space v a l u e s space t o space theta comma space t h a t space a r e colon
x equals 2 minus 3 sin straight pi over 2 equals negative 1 semicolon
y equals 3 plus 2 cos straight pi over 2 equals 3 semicolon
x equals 2 minus 3 sin fraction numerator 3 straight pi over denominator 2 end fraction equals 2 plus 3 equals 50 semicolon
y equals 3 plus 2 cos fraction numerator 3 straight pi over denominator 2 end fraction equals 3 semicolon
S o space a s space p e r space t h i s space t h e space p o i n t s space a r e space left parenthesis negative 1 comma 3 right parenthesis space a n d space left parenthesis 5 comma 3 right parenthesis.

    So here we used the concept of tangents and normals, we found the slope and then went to proceed for for the final answer. Using the vertical tangents we found equation and then the points.
    S o space a s space p e r space t h i s space t h e space p o i n t s space a r e space left parenthesis negative 1 comma 3 right parenthesis space a n d space left parenthesis 5 comma 3 right parenthesis.<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>S</mi><mi>o</mi><mo>&#xA0;</mo><mi>a</mi><mi>s</mi><mo>&#xA0;</mo><mi>p</mi><mi>e</mi><mi>r</mi><mo>&#xA0;</mo><mi>t</mi><mi>h</mi><mi>i</mi><mi>s</mi><mo>&#xA0;</mo><mi>t</mi><mi>h</mi><mi>e</mi><mo>&#xA0;</mo><mi>p</mi><mi>o</mi><mi>i</mi><mi>n</mi><mi>t</mi><mi>s</mi><mo>&#xA0;</mo><mi>a</mi><mi>r</mi><mi>e</mi><mo>&#xA0;</mo><mo>(</mo><mo>-</mo><mn>1</mn><mo>,</mo><mn>3</mn><mo>)</mo><mo>&#xA0;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#xA0;</mo><mo>(</mo><mn>5</mn><mo>,</mo><mn>3</mn><mo>)</mo><mo>.</mo></math>

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