Question

Si senA=3/4,hallar el valor de la expresion (senA) (secA).

Answer 1

sen A = c.o / h

se deduce que c.o = 3

h = 4
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para saber c.a se aplica pitagoras

c.a = $\sqrt{h^{2}- c.o^{2} }$
c.a = $\sqrt{7}$

sec A = h/c.a

entonces = (3/4)(4/$\sqrt{7}$) = 3/$\sqrt{7}$