Math, asked by tusharpaliwal4, 8 months ago

Show that :
(i) cos 20°. cos 40° - sin 20°. sin 40° = 1/2
PROPER EXPLANATION NEEDED.
CLASS11 TRIGONOMETRY
IIT JEE

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Answered by manaswi78

4

Answer:

hope it helps............

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Answered by muskan102003

1

Step-by-step explanation:

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