Modify a math expression comprised of Sin and Cos functions?

Questions
1

Hello,
I want to manipulate some big expression which is comprise of Sin and Cos function.
I want to use Sin and Cos throughout the manipulation and NO Tan, Cot, Sec and Csc function involved in the final output. Also, No multiple angle such as Cos(2x) etc. is involved in the final output. They Sould simply Sin and Cos. Is there such feature available.?

Larry

2

Expanding to avoid multiple angle arguments is easy enough e.g. using TrigExpand. But Sin[x]/Cos[x] will automatically evaluate to Tan[x] so anything along these lines will be fighting the core evaluator.