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lara [203]
3 years ago
13

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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