Indeed, we know that $$1.5 = \cot\theta = \frac{\cos\theta}{\sin\theta}$$ hence $$1.5\sin\theta = \cos\theta.$$ Squaring both sides we have $$2.25\sin^2\theta = \cos^2\theta$$ and since $\cos^2\theta = 1-\sin^2\theta$ we have $$\begin{align*} 2.25\sin^2\theta &= 1-\sin^2\theta\\ 2.25\sin^2\theta + \sin^2\theta &= 1\\ 3.25\sin^2\theta &= 1. Trigonometry. Sine, cosine, and related functions, with results in radians or degrees. The trigonometric functions in MATLAB ® calculate standard trigonometric values in radians or degrees, hyperbolic trigonometric values in radians, and inverse variants of each function. You can use the rad2deg and deg2rad functions to convert between radians So as you can see, since trig functions are really just relationships between sides, it is possible to work with them in whatever form you want; either in terms of the usual "sine", "cosine" and "tangent", or in terms of algebra. Example 2.4.6.2 2.4.6. 2. Express cos2(tan−1 x) cos 2 ( tan − 1 x) as an algebraic expression involving no Explanation: This comes straight from the definition. Secans is defined as inverse of cosine. Answer link. sec alpha=1/cos alpha This comes straight from the definition. Trigonometric identities related different trigonometric ratios i.e., sin, cos, tan, cot, sec, and cosec, with each other for various different angles. Out of all one of the most basic as well as useful identities are Pythagorean trigonometric identities which are given as follows: sin 2 θ + cos 2 θ = 1. 1+tan 2 θ = sec2 θ Why do we use Sin Cos Tan in physics? These trigonometry values are used to measure the angles and sides of a right-angle triangle. Apart from sine, cosine and tangent values, the other three major values are cotangent, secant and cosecant. When we find sin cos and tan values for a triangle, we usually consider these angles: 0°, 30°, 45°, 60 .

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