alleryStart learning →Evaluate tan 25° + tan 20° + tan 25° tan 20°.
A0
B1 / 2
C√3
D1
Answer & Solution
Correct answer: D. 1
Since tan45° = 1 = (tan25° + tan20°)/(1 − tan25° tan20°), the sum tan25° + tan20° + tan25° tan20° equals 1.
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