Sin 90+ Cos 90=
I know the answer is D, but can someone explain why its all cos and the angles as well? 30" to Fig 3-2 The components of vectors A and B are 42) 4) Ax -A sin 90° 3) A -Acos90° B -B sin60° Ay- A sin90° By B cos60 By B cos30 o) Ar -A co A cos90 By cos60
Find the exact value of the expression. sin (30) sin(90°) - cos (30) cos(90°) = Find the exact value of the expression. sin( – 45° ) sin( - 30°) = [ Write each expression as a single trigonometric function. sin(7x)cos(3x) – cos(7:c )sin(32) = Write each expression as a single trigonometric function. cos(6.c )cos(3x) - sin(62) sin(30) = Write each expression as a single trigonometric function. cos(7x)cos (4:0) + sin(78) sin(4x) =
Write the expression as a single function of a. cos (90° - a) Choose the correct function for cos (90° - «). O A. cos a OB. - sin a O c. sin a OD - COS a
Given that z = 3(cos 90° + i sin 90°), then the following is true. o 23 = et (cos +i sin + i i or simply +
LWW is(t) = A1 . cos(1000t +90) + A2 cos(2000t -90) Assume the system is in steady state. Find the current ia at times t1 47 ms: ia (t1) = B1 t2= 5m ms: ia (t2) = B2 kia(t) + R2 Given Variables: A1:9A A2:3A L:2 mH C:500 uF R1:10 ohm R2:2 ohm k:3 V/A Determine the following
Suppose 0 is in the interval 90° <O< 180°. Find the sign of the following. cos (0 + 90°) Choose whether the sign of cos (0+ 90°) is positive or negative. Negative Positive
x(t)=5 cos(60t)+2 cos(90*pi*t)+cos(180*pi*t) find the fundamental frequency
A 90-kg (including any equipment) skydiver drops out of a plane. Using an air density of 1.0 kg/m3, a frontal surface area of 1.0 m2, and a drag coefficient of 0.8, what will the skydiver's terminal velocity be? A. Less than 50 m/s B. Between 50 and 100 m/s C. Between 100 and 150 m/s D. More than 150 m/s v= square root -2 (90) (-9.81)sin90/.8(1.0)(1.0)
When you're solving for cos 90 degree can you show that in steps. Thanks!