- How to express (1+tan(x))/sec(x) in terms of sin and cos?

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In equal-tempered tuning the frequency (in Hz) of the note one tone above 220 Hz is...? 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)? What forms when propene reacts with HCN? A 25.0mL solution containing .60M HCl was titrated with 0.50M NaOH. Calculate the pH before the titration and at equivalence point? Multiply matrices A and B of any sizes legally (no size compatibility requirment). What kind of matrix multiplication am I?