Hello etheenThis is not true. Try it when for example.

e) secx-cosx=sinxtanx

Can you do it from here? (Use )

Again, this is not true. The LHS is and the RHS is , and they are not identical.f)sinxcosx/sinx=1+tanx\tanx

g)cosx/sinx-sinx/secx=cos^2xcotx

Factorise the numerator and then use .

Hopefully, you've got the idea now, and can do some of the remaining questions yourself. Show us your attempts if you want more help.

Grandad