i paid for a Mathway premium account to help me with this and it apparently can't. and they haven't replied to me about it either. so here are two examples of identities I have trouble verifying: (theta after every trig term in first one)

sin/ (1-cot)+ (cos)/ (1-tan) = (cos+sin)

sin (u+v)/ sin (u-v)= (tan (u)+ tan (v))/(tan (u)- tan (v))