Trigonometry Final Exam Grade Report

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Subject

Trigonometry

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tnyyneqb_101

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19

Rating

Trigonometry Final Exam - Grade Report

Score:

71% (70.6667 of 100 pts)

Submitted:

Aug 17 at 11:33am

Question: 1

Grade: 1.0 / 4.0

Simplify.

cos70°cos10°+sin70°sin10°=cos70°cos10°+sin70°sin10°= 1/2 (100%)

Solution

Use the formula for the cosine of a difference,

cos(θ1−θ2)=cosθ1cosθ2+sinθ1sinθ2cosθ1−θ2=cosθ1cosθ2+sinθ1sinθ2

where θ1=70°θ1=70° and θ2=10°θ2=10°.

cos70°cos10°+sin 70°sin10°=cos(70°−10°)=cos(60°)=cos70°cos10°+sin

70°sin10°=cos70°−10°=cos60°= 1212.

Question: 2

Grade: 1.0 / 4.0

Graph the exponential function.

f(x)=(15)xfx=15x

Choose the letter that corresponds to the correct graph.

D (100%)

A.

B.

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