1.

Prove that:(i) sinπ3-xcosπ6+x+cosπ3-xsinπ6+x=1(ii) sin4π9+7cosπ9+7-cos4π9+7sinπ9+7=32(iii) sin3π8-5cosπ8+5+cos3π8-5sinπ8+5=1

Answer» Prove that:

(i) sinπ3-xcosπ6+x+cosπ3-xsinπ6+x=1

(ii) sin4π9+7cosπ9+7-cos4π9+7sinπ9+7=32

(iii) sin3π8-5cosπ8+5+cos3π8-5sinπ8+5=1


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