WebRút gọn biểu thức sau: A= 2cos(5$\pi$-x)-3sin($\frac{7\pi}{2}$ +x)+cos($\frac{11\pi}{2}$-x)+cot(3$\pi$-x)+tan( $\frac{9\pi}{2}$ -x) Loga Sinh Học lớp 12 0 lượt thích 4 xem. 1 trả lời Thích Trả lời Chia s ẻ. Thuan1701 . Đáp án: `A=cosx-sinx` Giải thích các bước giải: ... Webcosecant, secant, and cotangent are basically flipping the fractions which is called reciprocal. E.g: 3/5 is turned into 5/3 when reciprocated. cos-1, sin-1, and tan-1 are when you use the same fractions but reverse their purpose. E.g: you use cos (55°) to find the side length and in another case you use cos-1(2/4) to find a missing angle.
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WebFree math problem solver answers your algebra, geometry, trigonometry, calculus, and statistics homework questions with step-by-step explanations, just like a math tutor. WebSep 16, 2016 · Since tan θ = θ cos θ and tan 2 π = tan 5 π 7, we have the product: = i ( 1 α 1) ( 1 α 3) ( PS: The origin of this problem lies in the so-called 'Coffin problems' of Soviet Russia, which were considered extremely difficult and asked specifically to Jewish students so that they would have much higher chances of rejection. haley wolf youtube
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WebSolution Verified by Toppr Correct option is C) Given expression is cot55 otan35 o+ tan12 ocot78 o We can rewrite the expression as: cot(90 o−35 o)tan35 o + tan(90 o−78)cot78 o We know that, cot(90 o−θ)=tanθ and tan(90 o−θ)=cotθ ∴ The expression becomes, tan35 otan35 o+ cot78 ocot78 o ⇒1+1 ⇒2 Hence, cot55 otan35 o+ tan12 ocot78 o=2 Web1,564 Live in jobs available in Youngsport, TX on Indeed.com. Apply to Customer Service Representative, Administrator, Caregiver and more! WebJul 10, 2015 · You get $\cos(7x)=0$ and $\cos(3x)\sin(4x) \ne 0$. As you've already figured out $\cos(7x) = 0 \implies x = \dfrac{2j+1}{14}\pi \quad (j \in \mathbb Z)$ haley wolf pa