Prove that 4(sin^4x + cos^4x)=cos4x+3 and therefore solve sin^4 + cos^4x=0.5 for 0

Proof:

The second part of your question seem truncated in the "for 0" part.

but for the expression to have that value (0.5) the angle should be pi/4 radians.

.632

step-by-step explanation:

6 * 1/10 = 3/5

3*0.01 = 0.03

3/5 + 0.03 = .63

2*0.002 = .002

.63 + 0.002 = .632

the function makes a strait line horizontally with no x intercept but a y intercept at 9.