prove that each of the following identities
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we know that sintheta+costheta=1
costheta=1-sintheta
secent theta+tantheta=1
1.sec(cos)(1)=1
1÷cos×cos=1
1=1
costheta=1-sintheta
secent theta+tantheta=1
1.sec(cos)(1)=1
1÷cos×cos=1
1=1
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