
Concept explainers
To simplify: The given trigonometric expression and check the result using the table feature of a graphing utility.

Answer to Problem 35E
sinϕ(cscϕ−sinϕ)=cos2ϕ
The result is numerically verified.
Explanation of Solution
Given information:
The given trigonometric expression:
sinϕ(cscϕ−sinϕ)
Formula used:
Reciprocal identity:
cscϕ=1sinϕ
Pythagorean identity:
cos2ϕ=1−sin2ϕ
Calculation:
As per problem,
The given trigonometric expression:
sinϕ(cscϕ−sinϕ)
Use the Reciprocal identity cscϕ=1sinϕ , to write the expression in terms of sine.
sinϕ(cscϕ−sinϕ)=sinϕ(1sinϕ−sinϕ) [Reciprocal identity] = sinϕ(1−sin2ϕsinϕ) [Subtract fractions,the LCD is sinϕ] = 1−sin2ϕ [Divide out common factors] = cos2ϕ [Pythagorean identity]
Graph:
Sketch the graph using graphing utility.
Step 1: Press WINDOW button to access the Window editor.
Step 2: Press Y= button.
Step 3: Enter the expressions Y1=sinϕ(cscϕ−sinϕ) and Y2=cos2ϕ , which is required to graph.
Step 4: Press GRAPH button to graph the function.
The curve of Y1 is indicated by black line and the curve of Y2 is indicated by yellow line. Both the curves coincide.
The table of values shows points (indicated in black in the graph) that coincide for both the expressions.
Interpretation: According to the above graph, it can be observed that Y1=Y2 as both the graphs coincide.
Therefore numerically, sinϕ(cscϕ−sinϕ)=cos2ϕ .
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