Respuesta :
Hello,
[tex] \dfrac{1}{1+sin(\theta)} + \dfrac{1}{1-sin(\theta)} \\\\ \dfrac{1-sin(\theta) + 1+sin(\theta)} {1-sin^2(\theta) }}\\\\ = \dfrac{2} {cos^2(\theta)} [/tex]
[tex] \dfrac{1}{1+sin(\theta)} + \dfrac{1}{1-sin(\theta)} \\\\ \dfrac{1-sin(\theta) + 1+sin(\theta)} {1-sin^2(\theta) }}\\\\ = \dfrac{2} {cos^2(\theta)} [/tex]
trigonometric identites
1. D
2. B
3. tangent identity
4. A
5. B. 2sec2 therma.
(also, the answer above me is NOT correct. the asnwer was 2sec2 therma.