Question

sin 35° cos 55° + sin 55° cos 35º =​

Answer 1

Answer:

Given Equation is sin35sin55 - cos35 cos55.

sin35 sin(90 - 35) - cos 35 * cos(90 - 35)

sin35 * cos 55 - cos 35 * sin35

-cos(35 + 55)

-cos(90)

0.

Hope this helps!

Answer 2

sin 35 cos 55 + sin 55 cos 35

sin 35 = cos (90 - 35) = cos 55

cos 35 = sin (90 - 35) = sin 55

Substituting in the main equation,

cos² 55 + sin² 55

1