Question

Tg 43° cos 137°, cos 47° - cos 43°× sin 47°​

Answer 1

Объяснение:

tg 43°*cos 137°=-0,611.

cos47°-cos43°×sin 47°=0,999

Answer 2

To evaluate the given expression, let's break it down step by step:

1. Tg 43°: This refers to the tangent of 43 degrees. However, since the expression doesn't involve the tangent function directly, we won't consider this part for the final result.

2. cos 137°: We can calculate the cosine of 137 degrees using a scientific calculator or trigonometric identity. The cosine of an angle is equal to the cosine of its reference angle. In this case, the reference angle for 137 degrees is 360° - 137° = 223°. Therefore, cos 137° = cos 223°.

3. cos 47°: We can calculate the cosine of 47 degrees using a scientific calculator or trigonometric identity.

4. cos 43°: Similarly, we can calculate the cosine of 43 degrees using a scientific calculator or trigonometric identity.

5. sin 47°: We can calculate the sine of 47 degrees using a scientific calculator or trigonometric identity.

Now, let's substitute these values into the expression:

cos 137° - cos 47° × sin 47° = cos 223° - cos 47° × sin 47°

After substituting the specific values for cos 137°, cos 47°, and sin 47°, you can evaluate the expression using a calculator or numerical computation tool.