2. Escribir cada expresión en términos de coseno. \( \begin{array}{ll}\text { a. } \sec \theta+\tan \theta & \text { f. } 5 \cos \theta+3 \csc \theta+\tan \theta \\ \text { b. } \cot \theta+\frac{1}{\sec \theta} & \text { g. } \frac{2 \operatorname{sen} \theta \sec \theta}{\tan \theta} \\ \text { c. } \frac{\tan ^{2} \theta}{5 \sec \theta} & \text { h. } \frac{\operatorname{sen} \theta \cdot \cot \theta}{5} \\ \text { d. } 3 \csc ^{2} \theta+\frac{1}{5 \sec \theta} & \text { i. } 5 \operatorname{sen}^{2} \theta+\frac{\tan ^{2} \theta}{3} \\ \text { e. } \tan ^{2} \theta+\frac{3 \cot \theta}{\operatorname{sen} \theta} & \text { j. }(1+\operatorname{sen} \theta)^{2}-\frac{2 \operatorname{sen} \theta}{3}\end{array} \)
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