The points labelled 1 sec θ csc θ represent the length of the line segment from the origin to that point. Sec theta 1 cos theta c b.

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### To rewrite the sine function in terms of tangent follow these steps.

**Sin2theta in terms of tan**. Sine cosine and tangent are all based on a right angled triangle. Math trig identities sin theta a c. Sin θ tan θ and 1 are the heights to the line starting from the x axis while cos θ 1 and cot θ are lengths along the x axis starting from the origin.

Plot of the six trigonometric functions the unit circle and a line for the angle θ 0 7 radians. Hence cos cancel 2 theta cancel cos theta sec theta tan theta sin theta cos theta. Start with the ratio identity involving sine cosine and tangent and multiply each side by cosine to get the sine alone on the left.

Trigonometric functions specify the relationships between side lengths and interior angles of a right triangle. For example the sine of angle θ is defined as being the length of the opposite side divided by the length of the hypotenuse. So we will look at the sine function and then inverse sine to learn what it is all about.

We define the three trigonometrical ratios sine θ cosine θ and tangent θ as follows we normally write these in the shortened forms sin θ cos θ and tan θ. Cot theta 1 tan theta b a. And now for the details.

Divided by the length of the hypotenuse. The length of the side opposite angle θ. Hope this helps sec theta tan theta sin theta 1 cos theta sin 2 theta cos theta but 1 sin 2 theta cos 2 theta.

Tan theta sin theta cos theta a b. Sin x sin x. We ll show here without using any form of taylor s series the expansion of sin θ cos θ tan θ sin theta cos theta tan theta sin θ cos θ tan θ in terms of θ theta θ for small θ theta θ.

They are very similar functions. Here are the generalized formulaes. Csc theta 1 sin theta c a.

Sin theta text opposite text hypotenuse cos theta text adjacent text hypotenuse tan theta text opposite text adjacent. Cos theta b c. Solve the pythagorean identity tan 2 θ 1 sec 2 θ for secant.

The sine of angle θ is. Replace cosine with its reciprocal function.

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