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[/ABCddot H,/C=90^(@),/ABC=theta,BC=2139...

[/_ABCddot H,/_C=90^(@),/_ABC=theta,BC=213913caAB=293ml(5)/(a)-:],[" The mater and for "],[(i)cos^(2)theta+sin^(2)theta=1cd" (ii) "cos^(2)theta-sin^(2)theta=(41)/(841)]

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