Cot thita =4/5 cos thita =?
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cost/sint=4/5 , sint=5cost/4, cost= 2/√41
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cot @=4/5
root (4^2+5^2)=root 41
so cos @=4/root41
sin@=5/root 41
root (4^2+5^2)=root 41
so cos @=4/root41
sin@=5/root 41
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