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( overline R = overline P + overline Q ) উদ্দীপকের ক্ষেত্রে - P = 50 N, Q = 40 N এবং OA = 0.5 হলে, OB = 0.4 m R = ( sqrt P^ 2 + Q^ 2 + 2 P Q cos alpha ) ( theta = tan^ - 1 left ( f | Suva Ai