Sin^4a(1-sin^4a)-tan^2a

Question

Options:

A. Sin^2a

B. Tan^2a

C. Sec^2a

D. Cos^2a 

Answer 1

Ritwika,

 

I am assuming that the a is the variable in this expression. (What else could it be?)

 

It looks like the object is to rewrite the expression using a trig function which is squared only.

 

One way to verify if any of these answers are plausible is to graph the original expression then compare it to the graphs of the four answers to see if any of them coincide.

 

Have you tried this?

 

Once you answer, I will let you know what I discovered about this problem.