If ΔABC is an acute angled then prove thatcos2A +cos2B +cos2C < 3/2
manoj jangra , 14 Years ago
Grade 12
Trigonometry> trignometry inequalities...
1 Answers
Saurabh Koranglekar
Last Activity: 4 Years ago
Dear student
For equilateral triangle the LHS = 3/2 != RHS
Kindly check and repost
Regards
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