Q46 of 51 Page 54

Evaluate: .

Formula: -


(i) sin2A + cos2A = 1


(ii) sec2A – tan2A = 1


(iii) cosec(90 – A) = sec A


(iv) cot (90 – A) = tan A


(v)


Sec A cosec(90 – A) – Tan A Cot(90 – A) + sin2 55 + sin2 35


= Sec A. sec A – tan A. tan A + sin2 55 + Cos2 (90 – 35)


= 1 + 1 = 2


tan 10 tan 80 tan 60 tan 20 tan 70




Therefore,



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