Math, asked by Anonymous, 1 year ago

can anyone pl explain me how this step came

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Answers

Answered by shivirani
3
Those who are common, have been written together
(2-2sinA) (1+cos A)

Anonymous: thanku
Answered by siddhartharao77
3

Answer:

[1 - sinA + cosA]² = 2(1 - sinA)(1 + cosA)

Step-by-step explanation:

LHS:

= [1 - sinA + cosA]²

= (1)² + (-sinA)² + (cosA)² + 2(1)(-sinA) + 2(-sinA)(cosA) + (2cosA)(1)

= 1 + sin²A + cos²A - 2 sinA - 2 sinA. cosA + 2 cosA

= 1 + 1 + 2 cosA - 2 sinA - 2sinA.cosA

= 2 + 2 cosA - 2 sinA - 2 sinA . cosA

= 2 - 2 sinA + 2 cosA - 2 sinA.cosA

= 2(1 - sinA) + 2 cosA(1 - sinA)

= (2 + 2 cosA)(1 - sinA)

= 2[1 + cosA][1 - sinA]

= RHS

Hope it helps!

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