sin17°cos13°+sin73°sin167°=sin17°cos13°+cos17°sin13°=sin30°= 1 2,故答案为: 1 2. 由条件利用诱导公式、两角和差的正弦公式,求得所给式子的值. 本题考点:两角和与差的余弦函数 考点点评: 本题主要考查诱导公式、两角和差的正弦公式的应用,属于基础题. 解析看不懂?免费查看同类题视频解...
=sin(47°+13°)sin60°= 3 2,故答案为: 3 2. 首先,根据诱导公式,化简为两角和的正弦的形式,然后,利用两角和的正弦公式进行化简即可. 本题考点:两角和与差的正弦函数 运用诱导公式化简求值 考点点评: 本题重点考查了诱导公式、两角和的正弦公式等知识,属于中档题. 解析看不懂?免费查看同类题视频解析查看...
cos58°cos13°+sin58°sin13°=cos(58°-13°)=cos45°= 2 2.故答案为: 2 2. 直接利用;两角和与差的余弦函数化简求解即可. 本题考点:两角和与差的余弦函数 考点点评: 本题考查两角和与差的三角函数化简求值,考查计算能力. 解析看不懂?免费查看同类题视频解析查看解答 特别推荐 热点考点 2022年高...
这三个按键的上面都有一个黄色的sin-1、cos-1、tan-1的符号，这就是求反三角函数的 首先要知道arc是反三角函数，是度数 tan-1 ①先按shift ②再按tan ③再按1 ④再按＝ 计算arctan角度时,要使用角度制即DEG制式,得的结果单位是"度",然后利用度分秒转换键化成度分秒的形式.例如arctan1.73=...
3.三角函数在各象限内的符号规律：第一象限全为正，二正三切四余弦三角函数倍角公式1、Sin2A＝2SinA＊CosA2、Cos2A＝CosA＾2－SinA＾2＝1－2SinA＾2＝2CosA＾2－13、tan2A＝（2tanA）／（1－tanA＾2）（注：SinA＾2是sinA的平方sin2（A））三角函数诱导公式1、（－α）＝－sinα、cos（...
t),b0+b1t+b2t2+⋯+bntn=q2(t)(8t3−4t2−4t+1)+r2(t),其中deg(r1(t)),deg...
Answer to: Given cos theta = - 12/13, with sin theta less than 0, find sin theta /2. By signing up, you'll get thousands of step-by-step solutions...
If sin theta = - 12/13; 270 deg < theta < 360 deg, find theta. If cos theta = {square root 3} / 2, find cos^2 theta. Find exact value of [csc theta (sec theta - sin theta)], given that tan theta = {square root 7} / 3 and theta is in quadr...
Three frame members (12) form an equilateral triangle and are constructed from continuous, wound laminae (13). Each frame member has a smooth surface (14) at the corners of the triangle so that when the core (11) is assembled these members lie at angles of 120 deg. relative to one ...
Stolk LML, Degraeuwe PLJ, Nieman FHM, De Wolf MC, De Boer A. Population pharma- cokinetics and relationship between demographic and clinical variables and pharma- cokinetics of gentamicin in neonates 2002;24:527-31. Google Scholar 38 Intravenous aminoglycoside therapy (amikacin, gentamicin, tobram...