Sin 5 x cos 4 x - cos 5 x sun 4 x = 0

Question

Sin 5 x cos 4 x - cos 5 x sun 4 x = 0

Answer 1

Sin5xcos4x - cos5xsin4x = 0
sin(5x - 4x) = 0
sinx = 0
x = πk, k∈z