What is sin((7pi)/4)?

3 Answers
May 1, 2018

sin(7*pi/4) = -sqrt2/2

Explanation:

pi in general equals to 3.142 in radian form or 180 degrees since 2pi = 360 degrees.

To solve the eqn, we need to convert the pi into degrees.

sin(7*pi/4) = sin(7*180/4)
sin(7*180/4) = sin(1260/4)
sin(1260/4) = sin(315)
sin(315) = -sqrt 2/2

May 1, 2018

-0.707

Explanation:

sin((7pi)/4)

radians to degrees:-

:.(7cancelpi^1)/cancel4^1xxcancel180^45/cancelpi^1=315^@

:.sin315^@=-0.707106781

May 1, 2018

rarrsin((7pi)/4)=-1/sqrt2

Explanation:

rarrsin((7pi)/4)=sin(2pi-pi/4)=-sin(pi/4)=-1/sqrt2