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"16. \\( \\tan 20 ^ { \\circ } + \\tan 25 ^ { \\circ } + \\tan 20 ^ { \\circ } \\cdot \\tan 25 ^ { \\circ } = \\)\n\\( \\begin{array} { l l } { \\text { (a) } - \\sqrt { 2 } } & { \\text { (b) } 1 } \\\\ { \\text { (c) } 1 / \\sqrt { 2 } } & { \\text { (d) } - 1 } \\end{array} \\)"

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