if tan A=24/7 and 180°

if tan A=24/7 and 180° if tan(1/2)x=2/5 and =IF(AND(NOT(A 关于COS TAN SIN1.If tan口萨=5/12,then find exact values of cos口萨,sin口萨,and then find the angle口萨 to the nearest degree.2.If cos口萨=-4/5 and 90° tan a +tan b=-4 ,tan a tan b=-7,求sin^2(a+b)+4sin(a+b)-cos ^2 (a+b)的值. 已知tan(a+β)=1/7,tan(a-β)=1/3,求tan（a+2β）旳值 tan（a-7／2派）=? 反函数计算机,如何算,要具体步骤,计算器上也要具体步骤,tan a=2tan a=-4/3tan a=-3/2tan a=-9/7 tan(27*-a)tan(49*-a)tan(63*+a)tan(139*-a)=?化简求值! 求证tan(x-y)+tan(y-z)+tan(z-x)=tan(x-y)tan(y-a)tan(z-x) =IF(B8>0,IF(AND(B8 已知tan[(π/7)+a]=5,则tan[(6π/7)-a]= if a+b=3 and a**2+b**2=7,求a**4+b**4=? If a and b are integers,10A3=1,152A7=3,and then 379A6 is equal to______.说明理由 求证:(tan a*sin a)/(tan a-sin a)=(tan a+sin a)/(tan a*sin a) If A is an angle such that sec(A) + tan(A) = 2,evaluate cos(A)求 COA A.求 COS..A 请写具体 excel函数if公式怎么嵌套超过7层啊大家帮忙我这个公式应该怎么才能设置成功啊=IF(AND(N4=一个月,O4=高,P4=配合),A,IF(AND(N4=一个月,O4=中,P4=配合),A,IF(AND(N4=一个月,O4=高,P4=配合),A,I if a and b are both positive intergers and a平方-b平方=7 .what is the value of a