Given that

show that

so replace with 2x

and using the indentity

Can I rearrange and replace it like this?

So I'll get, ;

cancel the two's and replace sec^2y

so after simplifying I get,

Can someone please help me from here, as I have tired to rearrange it but don't get the desired expression.

And I am not even sure what I have done so far is correct, which is probably why I am not getting the right expression?

Please check my working,

Thank you!