I cannot solve these can anyone help?


(sin(a+b))/(sin(a-b))=(tan(a)+tan(b))/(tan(a)-tan(b))



sin(2X)-tan(x)=tan(x)cos(2x)

Here are some hints:

First one - simply change the tan(a) and tan(b) terms to their sin/cos equivalents, then simplify by multiplying through both the numerator and denominator by a common factor. You will need to know the identities for sin(a+b) and sin(a-b) to finish it out,

For the second - again change tan to sin/cos, and replace the sin(2x) and cos(2x) bits by their equivalent sin and cos expressions.