Question

sin10°+sin70-sin40°=? ​

Answer 1

Answer:

Step-by-step explanation:

sin10+sin70-sin40

2sin40cos30-sin40

sin40(2cos30-1)

sin40(root3 -1)

approximately sin 40

Answer 2

Answer:

sin10 -sin40+sin40

sin x-siny= 2cos (X+y)sin (x+y)

2cos(40+10)sin (40-10)+sin70

2cos50sin30+sin70

sin30=1/2

2cos50*1/2+sin70

cos50+sin70