tig problem?

0 ⤊

solve
tanA + sec2A = 1
domain: -pieby2 (less than or equal to) A (less than or equal to) pieby2

2007-12-07 05:24:20 · 1 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics

-pie/2 greater than or equal to A less than or equal to pie/2

2007-12-07 05:32:27 · update #1

its not sec^2A .......it is sec2A as in it is a double angle.

2007-12-09 12:36:01 · update #2

1 answers

Use: 1 + tan² A = sec² A.
substitute into tanA + sec² A = 1
tanA + sec² A = 1
tanA + (1 + tan² A) = 1
tanA + 1 + tan² A = 1
tanA + tan² A = 0
tan A( 1 + tan A) =0
tan A = 0 ===> A = 0
1 + tan A = 0 ===> tan A = -1
arctan(-1) = -π/4
x = 0, -π/4

2007-12-08 23:11:48 · answer #1 · answered by jsardi56 7 · 0⤊ 0⤋