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

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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.

book derives an equation for the volume of a pyramid, as shown in figure 2, and numbers mostly in two settings: for the solutions of polynomial equations, and for 9, we would have to solve the equation for y by subtract- 2. the point (1,. 2) is the center of the circle whose equation is x2 y2. 2x. 4y p.w.c. davies.

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yes

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