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Delta ABC में a=8,b=15,c=17 है , तो sin"...

`Delta ABC` में `a=8,b=15,c=17` है , तो `sin""(A)/(2),sin""(B)/(2),sin""(C)/(2)` घाट कर इनसे cos A, cosB,cosC की गणना कीजिए ।

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