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  1. The value of tan 315° cot (–405°) is equal to
    1. –1
    2. 1
    3. 0
    4. 2
Correct Option: B

tan 315° . cot (–405°)
= –tan 315° . cot 405° [cot (–θ) = – cotθ]
= – tan (360° – 45°) . cot (360° + 45°) = – (–tan 45°) . cot 45°
= tan 45° . cot 45° = 1


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