Given the value of cos 25° ≈ 0.9063, enter the sine of a complementary angle. Use an expression relating trigonometric ratios of complementary angles.
cos 25° =___ ° ≈ ____
cos(x) = sin(90-x)
That's what the co- in cosine means: sine of the complement.
what do you mean i dont get it ..
what, you can't figure 90-25 ?
no like what i put in the boxes ..
im taking a practice test for next year lol im still in algebra 1 and have no knoledge in geometry yet
He did not understand my reply to the last question either. He clearly has not studied the material yet.
im not taking a geometry class yet .. im still in algebra 1
If you were taking geometry, you would be in serious trouble.
lol obviously.. i dont really understand any of this
To find the sine of the complementary angle, we can use the relationship between trigonometric ratios of complementary angles. The complementary angle of 25° is 90° - 25° = 65°.
The relationship between sine and cosine of complementary angles is:
sin θ = cos (90° - θ)
Therefore, to find sin 65°, we substitute θ = 65° in the above equation:
sin 65° = cos (90° - 65°)
cos (90° - 65°) can be simplified to cos 25°.
Given that cos 25° ≈ 0.9063, we can say that sin 65° ≈ 0.9063.