Reciprocal of Cosine is Secant
Cosine of -90 is 0.
it would be secant, 1/cosine
[ cos(Θ) ]-1 = 1/cosine(Θ) = secant(Θ)
All the angles in 4th quadrant have positive cosine and negative sine e.g. 280,290,300,310...etc.
cosine 45° = √2/2 (Square root of 2 over 2)
√ 1/2 = sine(45)= cosine(45) -Key
1.75
The sine and cosine of acute angles are equal only for 45° sin45° = cos 45° = 1/sqrt(2) = 0.7071
45 degree
at a 45 degree angle, or pi/4
It is cosine*cosine*cosine.
The number 1.414... (square root of 2) is two times the cosine or sine of a 45 degree angle. The reason for this is that for a 45 degree angle, the two sides are cosine and sine, they are equal, and if you solve using the Pythagorean theorem with a hypotenuse of 1, the two sides are each (21/2)/2.
what is the cosine of 3.14 ?
Cosine of 1 degree is about 0.999848. Cosine of 1 radian is about 0.540302.
Tangent = sine/cosine provided that cosine is non-zero. When cosine is 0, then tangent is undefined.
Cosine is 0.995