Trigonometry
posted by lee pearce .
function y=42sin(2t+pi/2), where t is measured in radians. choose one option which gives the value of the function when t=pi radians.
a)0 b)1 c)2 d)4 e)pi/4 e)pi/4 f)pi/2 g)pi h)2pi

Trigonometry 
Reiny
y=42sin(2t+pi/2) , when t= π
y = 4  2sin(2π + π/2) = 4  2sin(5π/2)
= 4  2sin(π/2) , since π/2 and 5π/2 are coterminal angles.
= 4  2
= 2 
Trigonometry 
lee pearce
Cheers Reiny
Respond to this Question
Similar Questions

maths
choose one option which is the equivalent in radians of an angle of 135 degrees. ( ð = pie 3.14...) A. ð / 2 B. 3ð / 2 C. 7ð / 8 D. 5ð / 4 E. 3ð / 4 F. 5ð / 8 da answer is E, Simply because with radians, pie iz treated as 180, … 
maths
the function y = 5 + 3 sin (pie t /3 + pie /2) choose one option which gives the value of the funtion when t = 3. choose the option which gives the period of the function. from the options below. 0, 1/6, pie/6, 2, 3, pie, 5, 6 wod … 
maths
the function y = 5 + 3 sin (pie t /3 + pie /2) choose one option which gives the value of the funtion when t = 3. choose the option which gives the period of the function. from the options below. 0, 1/6, pie/6, 2, 3, pie, 5, 6 wod … 
Trigonometry
Find the angular speed in radians per sec. of the second hand on a clock. How long does it take for the second hand to make one rotation? 
Trigonometry
A wheel is rotating at 200 revolutions per minute .find the angular speed in radians per second. 200 rpm =200*2pi radians/1 minute (1 rotation = 2pi radians) = 400pi radians/60 seconds =20/3 radians/second You can follow the same procedure … 
Trigonometry
Find the angular speed in radians per sec. of the second hand on a clock. My answer is 1 rpm =1*2pi radians/1minute(1 rotation = 2pi radians) =2pi radians/60seconds =1/30 radians/seconds It goes 2PI radians in 60 seconds. What happened … 
trigonometry
A satellite is orbiting the Earth in a circular orbit. It orbits the Earth 3 complete revolutions every 24 hours. How many radians does it travel in 19 hours? 
Math
function y = 42(2t+pi/2), where t is measured in radians. A.choose one option which gives the value of the function when t=pi radians B.choose one option which gives the period of the function in radians. a)0 b)1 c)2 d)4 e)pi/4 f)pi/2 … 
Algebra2
Find the values of the inverse function in radians. 1. sin^1(0.65)? 
Algebra 2
Find the values of the inverse function in radians. sin^1(0.65) a. 0.71+2pi n and 0.71+2pi n b. 0.71+2pi n and 3.85+2pi n c. 0.86+2pi n and 0.86 +2pi n d. 0.61+2pi n and 2.54+2pi n 2. tan^1(0.09) a.0.09+2pi n b. no such angle …