please answer both the questions
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ans of 1st question is 0 as cos90 =0
then if anything is multiplied by 0 it gives 0
2)cos15=sin75(identity)
cos75=sin15
so
(sin75-sin15)/(sin75-sin15)
=1
then if anything is multiplied by 0 it gives 0
2)cos15=sin75(identity)
cos75=sin15
so
(sin75-sin15)/(sin75-sin15)
=1
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