Question

(1+secA-tanA)/(1+secA+tanA) =

Answer 1

Answer:

Here is ur answer for the iodine question

Iodine is a solid that sublimes. If a mixture of iodine and sand is heated in a beaker, the iodine changes from solid to vapour directly. The vapour changes back to solid directly on a cold surface. The sand is not affected by the heat and remains in the beaker.

Step-by-step explanation:

I don't know this one sorry