If tan(145) = -1/1.43 , what is tan(-125) a. -1.43, b. 1.43, c. 1/1.43, d. -1/1.43

B. 1.43

Step-by-step explanation:

Because tan (180-θ)=-tan θ

Because tan (90+θ) = -cot θ

tan (-125) can be written as:

tan θ x cot θ =1

⇒tan 35 x cot 35 = 1

⇒

⇒

25/4

step-by-step explanation:

call segment cd's length x. because dc and ab are parallel, angle acd and cab, so triangles adc and abc are similar and we can set up the equation x / ac = ac / ab, or x / 5 = 5 / 4 and x = 25/4.

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