# Questions on Algebra: Trigonometry answered by real tutors!

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 Algebra: Trigonometry Solvers Lessons Answers archive Quiz In Depth

 Question 180552: This problem came from a worksheet given to us. It says: Find 2 values of theta that satisfy cot of theta = -0.2679 Click here to see answer by stanbon(57203)

 Question 180669: Given that cosA= -3/8, the one true statement is? 1. tan A = square root55/3, only 2. sin A= + with minus underneath square root 55/8 3. sin A= + with minus sugn under 3 square root2/4 4. sec A= + with minus under 8/3 Click here to see answer by eperette(173)

 Question 180677: Approximate, to the nearest 0.1°, all angles A in the interval [0°, 360°) that satisfy the equation. Separate your answers by commas. (a) tanA = 3.8948 (b) cotA = -0.9205 Thanks!! Click here to see answer by stanbon(57203)

 Question 180753: To graph a straight line passing through (5,-3) with slope -3, a second point is found on the line by starting at (5,-3) and going. a. 5 up and 3 to left b. 3 up and 1 to right\ c. 3 down and 3 to left d. 3 down and 1 to right Click here to see answer by Alan3354(30925)

 Question 180777: Simplify to a single trig function: (cos3x-cosx)/ (sin3x-sinx) PLEASE HELP ME I DON'T KNOW WHAT TO DO!!! Click here to see answer by stanbon(57203)

 Question 180775: Find the exact value of cot(75º). PLEASE HELP ME!!!!! I really dont know what to do!!! Click here to see answer by jim_thompson5910(28476)
 Question 180775: Find the exact value of cot(75º). PLEASE HELP ME!!!!! I really dont know what to do!!! Click here to see answer by stanbon(57203)

 Question 180737: Evaluate all possible principal angles in standard position sinE=1 Click here to see answer by eperette(173)

 Question 180735: If B is an angle in standard position and (3,5) are the coordiantes of a point on the terminal are mof B, then cos B is? Click here to see answer by eperette(173)

 Question 180736: Evaluate all possible principal angles in standard position cosB=4/5 Click here to see answer by eperette(173)

 Question 180794: Standing on the bank of a river, a surveyor measures the angle to the top of a tree on the opposite bank to be 23 degrees. He backs up 45ft and remeasures the angle to the top of the tree at 18 degrees. How wide is the river? Click here to see answer by stanbon(57203)
 Question 180794: Standing on the bank of a river, a surveyor measures the angle to the top of a tree on the opposite bank to be 23 degrees. He backs up 45ft and remeasures the angle to the top of the tree at 18 degrees. How wide is the river? Click here to see answer by josmiceli(9645)

 Question 180791: An 18ft ladder is leaning against a house. It touches the bottom of a window that is 14ft 6in above the ground. What is the measure of the angle that the ladder forms with the ground? Click here to see answer by nerdybill(6948)

 Question 180734: Show that the values are equal. 1-2 sin^2 30 degrees= cos 60 degrees Click here to see answer by eperette(173)

 Question 180731: Show that the values are equal. sin^2 60 degrees + cos^2 60 degrees=sin^2 45 degrees + cos^2 45 degrees Click here to see answer by eperette(173)

 Question 180730: The expression cot 30 degrees + csc 30 degrees has the value? Click here to see answer by eperette(173)

 Question 180676: Approximate to four decimal places: cot (234° 40') Thanks! Click here to see answer by eperette(173)

 Question 180984: The one false statement is; a. The sine of an angle in the second quadrant is the sine of the reference angle. b. The cosine of an angle in the third quadrant is the negative of the cosine of the reference angle. c. The tangent of an angle in the second quadrant is the tnagent of the reference angle. d. The secant of an angle in the fourth quadrant is the secant of the reference angle. Click here to see answer by stanbon(57203)

 Question 181069: Sec^2 45 degrees is the same as? a. sec(45 x 45) b. 2 sec 45 c. (sec 45) (sec 45) d. sec 90 PLEASE HELP Click here to see answer by Alan3354(30925)

 Question 181075: Oh God, Please Help I am so confused. Evaluate sin^2 pi/3+ cos^2 pi/6 - sin^2 5pi/3. Click here to see answer by eperette(173)

 Question 181072: Show how they equal. cos 90 degrees= square root 1 + cos 180 degrees/ 2 PLEASE HELP ME OUT Click here to see answer by eperette(173)

 Question 181074: PLEASE PLEASE HELP!!!!!!!!!!!!!!!!! show that they equal. 1 + cot 30 degrees cot 60 degrees/cot 30 degrees-cot 60 degrees=cot 30 degrees. Click here to see answer by eperette(173)
 Question 181074: PLEASE PLEASE HELP!!!!!!!!!!!!!!!!! show that they equal. 1 + cot 30 degrees cot 60 degrees/cot 30 degrees-cot 60 degrees=cot 30 degrees. Click here to see answer by solver91311(16868)

 Question 181067: In (triangle)PQR, m(angle) Hey can someone help, dont get it... Click here to see answer by Alan3354(30925)

 Question 181073: sHOW HOW THEY EQUAL tan 60 degrees- tan 30 degrees/1+ tan 60 degrees tan 30 degrees = tan 30 degrees. HEY CAN SOMEONE HELP, I AM LOST Click here to see answer by eperette(173)

 Question 181070: Show how both sides equal. 2 cos^2 30 degrees-1 = cos 60 degrees Click here to see answer by eperette(173)

 Question 181068: Find all possible angles in standard position. secD= -15/12 Click here to see answer by eperette(173)

 Question 181020: Simplify to a single trig function: (cos3x-cosx)/(sin3x-sinx). PLEASE HELP ME, I DONT KNOW WHAT TO DO!!!! Click here to see answer by Mathtut(3670)

 Question 181095: Find the amplitude, the period, and the phase shift for the given equation.For any fractions, enter as 'a/b' with no spaces. y = 7*sin(5x - Pi/2) Click here to see answer by Alan3354(30925)

 Question 181021: Simplify to a single trig function: (cos4x-cos2x)/(2sin3x). PLEASE HELP ME OUT AS SOON AS POSSSIBLE!!!!! Thanks in advance!!! Click here to see answer by Mathtut(3670)

 Question 181094: Find the amplitude, the period, and the phase shift for the given equation.For any fractions, enter as 'a/b' with no spaces. y = -5*sin(x/5 - Pi/2) Click here to see answer by Alan3354(30925)

 Question 181093: Find the amplitude, the period, and the phase shift for the given equation. y = 6*sin(x - Pi/3) Click here to see answer by Alan3354(30925)
 Question 181093: Find the amplitude, the period, and the phase shift for the given equation. y = 6*sin(x - Pi/3) Click here to see answer by Mathtut(3670)

 Question 180986: In (triangle)PQR, m <(angle)Q=90 degrees, PQ=1, and QR=3. The value for sec <(angle)R is ? Click here to see answer by Alan3354(30925)

 Question 181291: On a grid I need to provide all possible angles in standard position and all points to be drawn for secD= -15/12. COULD SOMEONE PLEASE ANSWER FOR ME. I AM STUCK Click here to see answer by Alan3354(30925)

 Question 181256: On a grid what will all the possible principal angles be for secD= -15/12. I have to place the points on the grid. Please help Click here to see answer by Alan3354(30925)

 Question 181425: Hi guys! How are you all doing tonight? I am having a difficulty solving this problem and forgive me if I post my topic in the wrong section. f(x) = xe^x a) Determine the intervals on which f is strictly increasing or decreasing. b)Determine the extreme value of f. c) Determine the intervals of concavity and of convexity and the inflexion points. Click here to see answer by Alan3354(30925)

 Question 181441: Solve each equation for the interval [0,2л): A. (sin2x+cos2x)²=1 B. tan2x-2cosx=0 PLEASE HELP ME!!!!! Click here to see answer by Alan3354(30925)