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.

i think the answer is seven, for if i'm being useless °ω°

step-by-step explanation:

hello i am doing good for you that it's summer in your country or state ; )

btw in my country we just have sun and rain as (because i live in the caribbean lol)

also, thx a lot for the points : )