Algebra 2

Find the exact value of each expression if 0 degrees < theta < 90 degrees
If tan (theta) = 1/2 , find cos(theta)
If cos(theta) = 8/17, find csc (theta)

Find the exact value of each expression is 180 degrees < theta < 270 degrees
7. If tan (theta)= 1, find cos(theta)

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asked by Amy
  1. Tangent is opposite / adjacent, so we can say that in tan (theta) = 1/2, the 1 and 2 are the sides of the right triangle and
    c^2 = a^2 + b^2
    c^2 = 1^2 + 2^2
    c = sqrt(5) is the hypotenuse.

    Cosine is adjecent / hypotenuse, so
    cos(theta) = 2 / sqrt(5)

    Method is the same for other questions.

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    posted by Jai

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