Math, asked by lucy2019, 10 months ago

plz help me fast plz

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Answered by sandy1816

0

Step-by-step explanation:

LHS

cos³A-4cos³A+3cosA/cosA +sin³A+3sinA-4sin³A/sinA

=3cosA-3cos³A/cosA+3sinA-3sin³A/sinA

=3cosA(1-cos²A)/cosA +3sinA(1-sin²A)/sinA

=3(sin²A)+3(cos²A)

=3(sin²A+cos²A)

=3

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