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Trigonometry

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1 Answer

Put values

 

tan 20 = 0.3639, tan 40 = 0.8390, tan 80 = 5.6713, cot 10 = 5.6713, tan 10 =0.1763

(2 x 0.3696) + 4(0.8390) + 8(5.6713) = 49.4656

9( 5.6713 - 0.1763) =49.455

Pretty close :) 

 

Comments

I don't think using a calculator is what the teacher/text author had in mind.

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