Find the expansion of `sin(A+B+C)`.

Find the expansion: sin (A - B + C)

Find the expansion: tan (A + B - C)

If sin A=3/5 , sin B=12/13 and sin C=7/25 where A,B,C are acute angles, find the value of sin (A + B + C).

Find the coefficient of a^3b^4c^5 in the expansion of (b c+c a+a b)^6dot

Find the coefficient of a^3b^4c^5 in the expansion of (b c+c a+a b)^6dot

Find the coefficient of a^3b^4c^5 in the expansion of (b c+c a+a b)^6dot

Find the number of terms in the expansion of (2a + 3b + c)^5

Find the coefficient of x^2 y^3 z^4 in the expansion of (ax -by +cx)^9 (b) a^2 b^3 c^4 d in the expansion of (a -b-c +d)^10