Question

what this means. ??​

Answer 1

ʜᴇʏᴀ ᴍᴀᴛᴇ ʜᴇʀᴇ ɪs ʏᴏᴜʀ ᴀɴsᴡᴇʀ 
.
.
●This means that the angle lies between 0 and 90 degree.

Answer 2

$\huge\mathfrak{HEYA \: !!!!}$

let theta be equal to A

0°<A<90°

this is a type of condition given in a question

it means that the value of the A which will u get must be above 0° and below 90°

also must not be equal to 0° or 90°

if you get value below below 0° or above 90° then u have to reject them