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CBSE Class 11-science Answered

if A+B+C=180 then find the value of secA(cosBcosC-sinBsinC)
Asked by | 01 Sep, 2012, 12:04: PM
answered-by-expert Expert Answer

A + B + C = 180°.

Now, sec A (cos B.cos C - sin B.sin C)

= sec A.cos (B + C)

= sec A. cos (180° - A)

= sec A. (-cos A)

= -1
Answered by | 02 Sep, 2012, 12:14: PM
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