- When do we say that : W=F.d Cos (theta) and when we say : W=F.d Sin(theta) with explain pls?

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Agree or disagree: it is not that shocking when someone fails math in school because math is hard? The empirical formula of hydrazine is NH2, and its molecular mass is 32.0 grams. What is its molecular formula? Pb(NO3)2 + KI ->? How do I read this on an architectural plan? 27'-3" Does this mean the specific measured area is 27 ft. 3 inches? If a and b are positive integers such that gcd(a,b)=210, lcm[a,b]=210^3, and a** **