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CBSE Class 10 Answered

trigno
Asked by | 15 Dec, 2008, 12:32: PM
answered-by-expert Expert Answer

since secθ=cosec 60o

then cosθ = sin 60o

so 2cos2θ - 1 = 2sin260o - 1 = 1/2

Answered by | 15 Dec, 2008, 12:51: PM
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