Respuestas

2012-12-15T20:50:57+01:00

 

sec² . (cosec² - 1) = cosec²
( 1 + tg²  ) ( 1 + cotg²  - 1) = cosec² 

( 1 + tg²  ) ( cotg²  ) = cosec² 

( 1 + tg² ) ( 1/ tg² ) = cosec² 

1/ tg²  + 1 = cosec²  

cotg²  + 1 = cosec² 

cosec²  = cosec²