Question

Sin^2 25°+cos^2 25°-1/2sin30°

Answer 1

Вот 1-1/2*1/2=1-1/4=3/4

Answer 2

Let's break down the given expression step by step.

sin^2(25°) + cos^2(25°) - (1/2)sin(30°)

First, let's evaluate the trigonometric values:

sin(25°) ≈ 0.4226 cos(25°) ≈ 0.9063 sin(30°) = 0.5

Now, substitute these values into the expression:

sin^2(25°) + cos^2(25°) - (1/2)sin(30°) ≈ (0.4226)^2 + (0.9063)^2 - (1/2)(0.5)

Calculating each part:

(0.4226)^2 ≈ 0.1788 (0.9063)^2 ≈ 0.8217 (1/2)(0.5) = 0.25

Substituting these values back into the expression:

0.1788 + 0.8217 - 0.25 ≈ 0.1788 + 0.8217 - 0.25 ≈ 0.9993 - 0.25 ≈ 0.7493

Therefore, sin^2(25°) + cos^2(25°) - (1/2)sin(30°) is approximately equal to 0.7493.