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sisam=√simi²-side²
=√3²-2²
=√9-4
=√5
tan A= side/sisam
=2/√5x√5/√5
= 2/5 √5
2.tan A=3=side/sisam
simi=√3²+1²
=√9+1
=√10
sin A=side/simi
=3/√10x√10/√10
= 3/10√10