cos ²A + cos²(120⁰+A)+cos² (120⁰-A)
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Answered by
6
Step-by-step explanation:
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Answered by
7
Answer:
3/2
Step-by-step explanation:
cos^2A+(1+cos2A+240)/2+(1+cos2A-240)/2
=>cos^2A+(2+cos(2A+240)+cos(2A-240))/2
=>cos^2A+1+(2cos2Acos240°)/2
=>cos^2A+1+cos2A(-1/2) (Since,cos240°=-1/2)
=>cos^2A +1-(2cos^2A-1)/2
=>cos^2A+1-cos^2A+1/2
=>1+1/2
=>2+1/2
=>3/2
Hope this would help you
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