3. Let sin 21 = 0.358. What is the value of x for cos x=0.358?

Step-by-step explanation:

We will use the co-function identity for sine, where:

Since sin(21)=0.358=cos(x). This means that:

Solve for x. Add x to both sides:

Subtract 21 from both sides:

Hence:

hello from mrbilldoesmath!

answer:

x - 3

discussion:

x^2 - 9 = (x-3) (x+3)   so

(x^2-9)/ (x + 3) = x-3

you,

mrb

11

step-by-step explanation:

32.50-7.50=25

225/25=11