I believe the answer would be 4 sorry if it’s wrong
Answer:
............. 70°................
Answer:
-(4/7)
or
if you are above 11th standard
4/7i
The student that simplified the expression incorrectly is student 2
<h3>How to determine the incorrect result?</h3>
The steps are given as:

Student 1:
- Step 1:

- Step 2:

- Step 3: 1 + tan²(Ф)
- Step 4: sec²(Ф)
Student 2:
- Step 1:

- Step 2:

- Step 3: sec²(Ф)/tan²(Ф)
- Step 4: csc²(Ф)
As a general trigonometry rule;

This means that student 1 is correct, while student 2 is not
The first error in student 2's workings is in step 2, where we have:

The above expression is not justified and cannot be proved by any trigonometry rule
Since the step 2 is incorrect, the other steps cannot be used.
Hence, the student that simplified the expression incorrectly is student 2
Read more about trigonometric expressions at:
brainly.com/question/8120556
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Answer:
no cap 2
Step-by-step explanation: