Question:
Select expression that is mathematically equivalent to

a) 
b) 
c) 
d) 
Answer:

Step-by-step explanation:
Given

Required
Determine its equivalent
Start by writing y - z in bracket;

becomes

When - is used as divide, it is equivalent to /
The given expression can then be rewritten as

Hence;
<em />
<em> is equivalent to </em>
<em />
Answer:
x = 40°
Step-by-step explanation:
using the cofunction identity
cos(90 - x) = sin x , so
90 - x = 50 , then
x = 40
that is sin40° = cos50°
Answer:
2. 91/12 or 7+7/12
3. 3+14/27
4. 35 / 192
my answers were all wrong (idk how) the working isnt there, but these are right 100%, when you divide fractions you multiply by the reciprocal