Asked by amy
how to find the value of sec theta -15/4 and Tan theta 12 when theta is greater than zero and less than 360
Answers
Answered by
Steve
For all these, draw a triangle in the standard position. Then recall that
sinθ = y/r
cosθ = x/r
tanθ = y/x
For the first one here, you have
secθ = -15/4
so,
cosθ = -4/15
Now cosθ is negative in QII and QIII, so you find cos^-1(-4/15) in those quadrants.
sinθ = y/r
cosθ = x/r
tanθ = y/x
For the first one here, you have
secθ = -15/4
so,
cosθ = -4/15
Now cosθ is negative in QII and QIII, so you find cos^-1(-4/15) in those quadrants.
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