If cos x = -4/5, and pi < x < (3pi)/2, what is sin(x + pi/2) and you : ) xx

Try this solution:

note, that sin(pi/2+x)**=cosx, it means sin(x+pi/2)= -4/5.

ps/ ** may be used the formula sin(a+b)=sinacosb+sinbcosa.

repeat the question

step-by-step explanation:

fist on the left goes with the third on the right. second on the left goes with the fourth on the right. third on the left goes with the second on the right. the fourth on the left goes with first on the right