3 years ago

Help me make it simple C=cos25°cos35°-cos65°cos85°

Mathematics

1 answer:

nikdorinn [45]3 years ago

4 0

Answer:

It invaluatesa to 1

Step-by-step explanation:

sin25 ∘cos65 ∘+cos25 ∘sin65 ∘=sin25

∘ sin(90 ∘−65 ∘)+cos25

∘cos(90 ∘−65 ∘ )

=sin25 ∘

sin25 ∘ +cos25 ∘cos25 ∘

=sin 2 25 ∘+cos 2 25 ∘=1

hope this helped you!

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Help me make it simple C=cos25°cos35°-cos65°cos85°​

Help me make it simple C=cos25°cos35°-cos65°cos85°