ID: 93hcg2w5dr

(a + b)(a−b) t" dt Inde sin a Cos tga = (a+b)(a-b) a sin² α + cos² α = 1 2a -b± √b²-4ac 2 in² a + cos² a SPORTY RICH ATHLETIC CLUB 2 + cos #07 þ sin a CosFa + cos² (a + b)(a−b) =a² (a + b)(a - b) =a²-b² 2 α = 1