- Algebraic expression equal to: sin( arctan[(2x+3)/(5x)] )?

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Outside temperature over a day can be modelled as a sinusoidal function.? Naphthalene sublimation rate=3*10^-5/min. Volume of room=60m^3. How would I calculate the naphthalene concentration in the air of the room? If 5sinθ = 3 determine the value of:
1. cos (θ-360)
2. Tan (squared)θ
3. Sin θ x cos θ (all divided by cos (squared θ)? In equal-tempered tuning the frequency (in Hz) of the note one tone above 220 Hz is...? Help me to solve the following question!
Find integers x and y such that 57x+79y=17, and 400