How is CAST method used for trigonometric ratios
Answers
Answer:
Step-by-step explanation:
n this method you draw a set of axes and label the quadrants 1, 2, 3 and 4 with the letters A, S, T and C respectively as shown in the diagrams below. The letters mean:
A: all three functions, sine, cosine and tangent are positive in this quadrant
S: only the sine function is positive in this quadrant
T: only the tangent function is positive in this quadrant
C: only the cosine function is positive in this quadrant
Next you draw two triangles in standard position on the diagram. The two triangles are congruent (identical) and must be drawn in the two quadrants that have the correct sign for your function. The various diagrams below show all the possible combinations. Make sure that you understand each of them. Then you use your calculator to get the first angle, θPV , and finally you use the symmetry of the diagram to get the second angle, θ2 .
hope it is helpfull to u
Answer:
The CAST rule is a special rule used often as a memorization acronym in trigonometry. ... Starting in quadrant 4 and going in a counter clock-wise fashion, the CAST rule will tell us what trigonometric ratios (cosine, sine, and tangent) are always positive in said quadrants.