Math, asked by bickyprasad022, 9 months ago

Evaluate each of the following
sin 20° sin 70° - cos 20° cos 70°​

Answers

Answered by CUPCAKE2103
1

Answer:

0

Step-by-step explanation:

sin 20° sin 70° - cos 20° cos 70°

= sin 20° sin (90°-20°) - cos 20° cos (90°-20°)

=sin 20° cos 20° - cos 20° sin 20°

=0

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