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In any triangle ABC If sinA : sinB: sinC...

In any triangle ABC If sinA : sinB: sinC=4:5:6,then prove that cos A :cosB: cosC=12:9:2.

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UNITED BOOK HOUSE-MCQ-EXERCISE
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  5. Solve :cos^3xcos3x+sin^3xsin3x=0

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  6. In any triangle ABC If sinA : sinB: sinC=4:5:6,then prove that cos A ...

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  13. If the coefficient of-four successive termsin the expansion of (1+x)^n...

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  14. If s1,s2,s3are thesums of n natural numbers, theirsquares, their cubes...

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