Question

Cos theta=4/9
state the five trigonometric ratios for each acute angle theta.

Answer 1

Draw a TRIANGLE.


/ |
/ |
9 / |
/ |
/ | √65
/ |
/ |
/ θ |
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4

P.S. I used Pythagorean Theorem for remaining side.

cos θ = 4/9
sin θ = √65/9
tan θ = √65/4
csc θ = 9/√65
sec θ = 9/4
cot θ = 4/√65