Math, asked by par7, 1 year ago

cosa+sina=√2cosa then show that cosa-sina=√2sina

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Answered by sushant2505
13
Hi...☺

Here is your answer...✌

GIVEN THAT,

cosA + sinA = √2 cosA

Squaring both sides
We get,

cos²A + sin²A + 2sinA cosA = 2cos²A

1 + 2sinA cosA = 2(1-sin²A)

2sinA cosA = 2 - 2sin²A - 1

2sin²A = 1 - 2sinA cosA

=> 1 - 2sinA cosA = 2sin²A

cos²A + sin²A - 2sinAcosA = 2sin²A

(cosA - sinA)² = 2sin²A

cosA - sinA = √2 sinA

[PROVED]
Answered by soh2
2
Hallo friend here is ur answer

Hope it will help u
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soh2: please mark it as brainliest
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