Tan y2 sec y - tan y22 sec y2 - tan y23 sec y22 - -n terms

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Properties Derived from Trigonometric Identities

tan y2 sec ...

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tan $\frac{y}{2}$ sec y + tan $\frac{y}{2^{2}}$ sec $\frac{y}{2}$ + tan $\frac{y}{2^{3}}$ sec $\frac{y}{2^{2}}$ + ...n terms

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