# Cos 90 degrees

cos(55°) = x1, or F ()270 N cos(55) x1 = ° and 270 N F sin(55°) = y1, or F ()270 N sin(55) y1 = °. MATLAB can be used to solve for F x1 and F y1 using its built-in sin() and cos() functions, but these functions assume that the angle will be expressed as radians, not degrees. The factor pi/180 is used to convert the angle from degrees to ... Well, it's going to be the cosine of 90 minus 60. It's going to be the cosine of 30 degrees. 30 plus 60 is 90. And of course, you could go the other way around. We could think about the cosine of theta. The cosine of theta is going to be equal to the adjacent side to theta, to angle A, I should say. And so the adjacent side is right over here ... Aug 23, 2012 · tan 90 = sin 90 / cos 90 = 1/0 which is NOT DEFINED Similarly, we have sec = 1/cos , cot = cos / sin and cosec = 1/ sin . Hence, all the tan, sec, cosec and cot values can be filled now. Sep 24, 2008 · I can't quite figure out what my textbook is asking of me. I have a chart that compares degrees with their cos, sin, and tan values. The questions include the phrase: "to the nearest degree". I'm not sure what they mean by this. For instance 1) Find angle 'B' with hypotenuse '9' and opposite... how to derive and memorize the trigonometric ratios of the special angles, how to use the trig ratios of the special angles to find exact values of expressions involving sine, cosine and tangent values of 0, 30, 45, 60 and 90 degrees, How to find sin, cos, tan, cot, csc, and sec of the special angles, and multiples of 90, examples with step by step solutions, How to remember special angles ...