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ESFÉRICA.

579

8

9

5

dBC:

dAC

::

tang

BC:

tang

AC.

8 9

6

Si

A== 9

oº,

dBC: dAC

::

R

:

cos C; porque

(

6 9 9

)

R

:

cos

C

::

tang

BC:

tang

AC.

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