Math, asked by vkereeeti3082, 19 days ago

If sin A + cos A = 0 what is sin2 A- cos2 A

Answers

Answered by bhanuprakashmuddala

0

Answer:

-1

Step-by-step explanation:

Given sinA+cosA=0

cosA= -sin A

sin2A = 2sinAcosA= -2sin²A

cos2A=1-2sin²A

sin2A-cos2A = -2sin²A-(1-2sin²A)

= -2sin²A-1+2sin²A

= -1

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