Math, asked by ayushsinghas282004, 6 months ago

2 cos² A + cos A -1 =0

Answers

Answered by Nihar1729

Answer:

cosA= -1 or 1/2 So, A= 180° or 60⁰

Step-by-step explanation:

2cos²A+cosA-1=0
cosA= [–1±√(1²+8)]/4
cosA=(–1±3)/4
cosA= -1 or 1/2
so A is 180⁰or60⁰
thanks
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2 cos² A + cos A -1 =0​

Answers

2 cos² A + cos A -1 =0