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Question

In right triangle ABC, BC=7cm,ACAB=1cm and B=90o. The value of cos A + cos B+ cos C is

A
17
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B
3224
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C
3125
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D
2531
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Solution

The correct option is C 3125
AC2=AB2+49
(ACAB)(AC+AB)=49
AC+AB=49
cosA+cosB+cosC=2425+0+725=3125
1147731_105822_ans_efc262475c64446abcf4867afabd030d.jpg

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