InterviewSolution
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InterviewSolution
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Prove that: ???? +????sin ?−????+???? −????sin ?+????=2???2?−???2? |
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Answer» 2/1-2çóß²A Join this meet.google.com/vkd-rwgd-dbx 1)\xa0(a+b)²+(a-b)²\xa0=\xa02(a²+b²)2)\xa0(a-b)(a+b)\xa0=\xa0a²-b²andBy\xa0Trigonometric\xa0identity:sin²A+cos²A\xa0=\xa01\xa0*/*//*\xa0By\xa0Trigonometric\xa0identity:cos²A\xa0=\xa01-sin²A*/Therefore, |
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