Chapter 5 - Trigonometric Identities - Section 5.4 Sum and Difference Identities for Sine and Tangent - 5.4 Exercises - Page 223: 78b

$F = 577.168~cos~\theta$ When we graph this function, we can see that $F= 400~lb$ when $\theta \approx 46^{\circ}$

$F = \frac{0.6~W~sin(\theta+90)}{sin~12}$ $F = \frac{0.6~(200)~sin(\theta+90)}{sin~12}$ $F = 577.168~sin(\theta+90)$ $F = 577.168~cos~\theta$ When we graph this function, we can see that $F= 400~lb$ when $\theta \approx 46^{\circ}$