Question

Find the value of sin 70° cos 20 °+ cos 70° sin 20 °​

Answer 1

Step-by-step explanation:

Sin (90-70) cos 20 +cos (90-70) sin20

Cos 20. Cos 20 +sin20. Sin 20

O+0=0

Answer 2

Answer:

1

Step-by-step explanation:

sin20° cos70° + sin70° cos20°

= cos(90° – 20°)cos70° + sin70° sin(90° – 20°)

= cos 70° cos70° + sin70° sin70°

=cos^270° + sin^270°

= 1