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三角函数问题,往往因公式繁多、变形技巧高、运算量大而难以求解.本文举两例说明,适当应用物理知识可使数学变得简单. 例1 求cos5°+cos77°+cos149°+cos221°+cos293°的值.
Trigonometric functions are often difficult to solve due to a large number of formulas, high deformation techniques, and large computational loads. Two examples are given in this paper. Appropriate application of physics knowledge can make mathematics simple. Example 1 Find cos5°+cos77°+cos149°+cos221 The value of °+cos293°.