cosa = 1/√5
tga=sina/cosa
sin²a = 1-cos²a
sin²a = 1-(1/√5)² = 1-1/5 = 4/5
sina = 2/√5
tga = 2/√5 : 1/√5 = 2
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Verified answer
cosa = 1/√5
tga=sina/cosa
sin²a = 1-cos²a
sin²a = 1-(1/√5)² = 1-1/5 = 4/5
sina = 2/√5
tga = 2/√5 : 1/√5 = 2