If , and , prove that

(1)

(2) Prove that

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- October 7th 2009, 12:37 AMthereddevilstrigonometry (3)
If , and , prove that

(1)

(2) Prove that - October 7th 2009, 08:50 AMred_dog
1) We have

Then we have to prove that

Use the inequality

for

using that

- October 8th 2009, 03:38 AMmathaddict