Find the third side to the following non-right triangle (there are two possible answers). Round to the nearest tenth of a yard. 

\( A = 29.7 ^ { \circ } , a = 3.9 yd , b = 6.4 yd \) 

\( c = \square yd , \square yd\) 

Complete the following statement. For a point \( P ( x , y ) \) on the terminal side of an angle \( \theta \) in standard position, we let \( r = \) _______. \( \sin \theta = \) ________, \( \cos \theta = \) _________, and \( \tan \theta = \)________. 

In triangle \(A B C\) , if altitude \(A D\) is drawn to side \(B C\) , which of the following must be true? 

(1.) \(\angle ADB \cong \angle A D C\) 

2. \(\overline { B D } \cong \overline { D C } \) 

3. \(\triangle A D B \cong \triangle A D C\) 

4. \(\angle B \cong \angle C\) 

1) Use the limit definition of the derivative \(( \lim _ { h \rightarrow 0 } \frac { f ( x + h ) - f ( x ) } { h } ) \) together with the tangent addition formula to prove that \(\frac { d } { d x } [ \tan x ] = \sec ^ { 2 } x\) 

Tangent Addition Formula: \(\tan ( x + y ) = \frac { \tan x + \tan y } { 1 - \tan x \tan y } \) 

You may also use this graph: \(f ( x ) = \frac { \tan x } { x } \) 

Find all the solutions to \(\displaystyle \left ( { 2t - 3} \right ) \tan \left ( { \frac { { 6t} } { { 11} } } \right ) = 15 - 10t\). Use at least 4 decimal places in your work.