Answer to: What is cos(x) times cos(x) simplified? By signing up, you'll get thousands of step-by-step solutions to your homework questions. You...
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$$【解析】 \cos ( a + b ) \times \cos ( a - b ) \\ = ( \cos a \cos b - \sin a \sin b ) ( \cos a \cos b + \sin a \sin b ) \\ = ( \cos a \cos b ) ^ { 2 } - ( \sin a \sin b ) ^ { 2 } \\ = ( \cos a \cos b ) ^ { 2 ...
【解析】证明: $$ \cos ( A - B ) \times \cos ( B - C ) \times \cos ( C - A ) \\ = 0 . 5 \times \left[ \cos ( A - C ) + \cos ( A + C - 2 B ) \right] \times \cos ( C - A ) \\ = 0 . 5 \times \cos ( A - C ) \times \cos ( C ...
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【题目】两个余弦函数之和:$$ \cos ( k _ { 1 } \times x ) + \cos ( k _ { 2 } \times x ) $$,可以通过“和差化积”$$ 2 \cos \left[ \frac { k _ { 1 } + k _ { 2 } } { 2 } \right] \times \cos \left[ \frac { k _ { 1 } - k _ { 2 } } {...
【解析】 4.D A.$$ y = \sqrt { x } $$,定义域0,+∞),是非奇非偶函数; B.$$ . y = \cos x , f ( x ) = \cos x = \cos ( - x ) = f ( - x ) $$,是偶 函数; C.$$ . y = | x | , f ( x ) = | x | = | - x | = f ( - x ) $$,...