cost=√(1-sin²t)=√(1-4/9)=√(5/9)=√5/3
tgt=sint/cost=-2/3:√5/3=-2/√5=-2√5/5
ctgt=1/tgt=-√5/2
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cost=√(1-sin²t)=√(1-4/9)=√(5/9)=√5/3
tgt=sint/cost=-2/3:√5/3=-2/√5=-2√5/5
ctgt=1/tgt=-√5/2