how to prove that :4 cos 3 20 – 3 cos 20=2 cos (3.20)
how to prove that :
4 cos 3 20 – 3 cos 20=2 cos (3.20)
Diya , 4 Years ago
Grade 11
Trigonometry> how to prove that : 4 cos 3 20 – 3 cos 20...
1 Answers
Saurabh Koranglekar
Last Activity: 4 Years ago
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