(cos420-sin390)(cos420+sin390)(sin²240+sin²390+sin²60) – InterviewSolution

1.	(cos420-sin390)(cos420+sin390)(sin²240+sin²390+sin²60)
Answer» 0(Zero)Step-by-step EXPLANATION: (cos420-sin390)(cos420+sin390)(sin²240+sin²390+sin²60)=(cos²(360+60) - sin²(360 +30))( sin²(180+60) + sin²(360+30)+sin²60)=(cos²(60) - sin²(30))(sin²(60)+sin²(30)+sin²(60))=(0.25-0.25)(sin²(60)+sin²(30)+sin²(60))=0*(sin²(60)+sin²(30)+sin²(60))= 0

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