Bài 1

import math

a = float(input("Nhap goc a (do): "))
b = float(input("Nhap goc b (do): "))

a_rad = math.radians(a)
b_rad = math.radians(b)

sin_a = math.sin(a_rad)
cos_a = math.cos(a_rad)
sin_b = math.sin(b_rad)
cos_b = math.cos(b_rad)

sin_tong = sin_a * cos_b + cos_a * sin_b
cos_tong = cos_a * cos_b - sin_a * sin_b
sin_hieu = sin_a * cos_b - cos_a * sin_b
cos_hieu = cos_a * cos_b + sin_a * sin_b

print(f"sin({a}+{b}) theo cong thuc = {round(sin_tong, 4)}")
print(f"sin({a+b}) tinh truc tiep    = {round(math.sin(math.radians(a+b)), 4)}")
print(f"cos({a}+{b}) theo cong thuc = {round(cos_tong, 4)}")
print(f"cos({a+b}) tinh truc tiep    = {round(math.cos(math.radians(a+b)), 4)}")
print(f"sin({a}-{b}) theo cong thuc = {round(sin_hieu, 4)}")
print(f"cos({a}-{b}) theo cong thuc = {round(cos_hieu, 4)}")