Sine and cosine are cofunctions, which means that their angles are complementary. Consequently, sin (90° - x) = cos x. Secant is the reciprocal of cosine so that sec x = 1/(cos x). Knowing these properties of trigonometric functions, among others, will really help you in other advance math courses.
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sine = sqrt(1 - cosine^2)sine = secant/sqrt(secant^2 - 1)
cosine = sqrt(1 - sin^2)
cosine = 1/secant
secant = 1/sqrt(1 - sine^2)
secant = 1/cos
sine, cosine, tangent, cosecant, secant and cotangent.
Sine, Cosine, Tangent, Cotangent, secant and cosecant
sine, cosine, tangent, cosecant, secant and cotangent.
Since secant theta is the same as 1 / cosine theta, the answer is any values for which cosine theta is zero, for example, pi/2.
The negative sine graph and the positive sine graph have opposite signs: when one is negative, the other is positive - by exactly the same amount. The sine function is said to be an odd function. The two graphs for cosine are the same. The cosine function is said to be even.