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একই বিন্দুতে α কোণে ক্রিয়ারত P ও Q বলের লব্ধি R হলে-

i. R = P + Q, যখন α = 90° 

ii. R = P~Q, যখন α = 180°

iii. Q = P হলে R = 2P cos α2

নিচের কোনটি সঠিক?

Created: 3 weeks ago | Updated: 3 weeks ago

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