Seudónimo Seudónimo
  • 01-05-2016
  • Mathematics
contestada

Simplify the expression: 1/1+cot^2x
a.sec^2x
b.csc^2x
c.sin^2x
d.cos^2x
e.tan^2x

Respuesta :

Аноним Аноним
  • 02-05-2016
[tex]\sin ^{ 2 }{ x } +\cos ^{ 2 }{ x } =1\\ \\ \frac { \sin ^{ 2 }{ x } }{ \sin ^{ 2 }{ x } } +\frac { \cos ^{ 2 }{ x } }{ \sin ^{ 2 }{ x } } =\frac { 1 }{ \sin ^{ 2 }{ x } } \\ \\ 1+\cot ^{ 2 }{ x } =\csc ^{ 2 }{ x } [/tex]

Because of this...

[tex]\frac { 1 }{ 1+\cot ^{ 2 }{ x } } \\ \\ =\frac { 1 }{ \csc ^{ 2 }{ x } } [/tex]

But...

[tex]\frac { 1 }{ \csc ^{ 2 }{ x } } =\sin ^{ 2 }{ x } [/tex]

Therefore:

[tex]\frac { 1 }{ 1+\cot ^{ 2 }{ x } } =\sin ^{ 2 }{ x } [/tex]

Answer:

(c)
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