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ICSE Class 9 Answered

If cos A + sec A = 2, find value of cos2 A + sec2 A. 
Asked by natashagupta50.9spicertl | 30 Sep, 2020, 15:41: PM
answered-by-expert Expert Answer
cosA + secA = 2
(cosA + secA)2 = 22
cos2A + sec2A + 2 cosA secA = 4
cos2A + sec2A + 2 = 4
cos2A + sec2A = 2
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