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of $90^\\circ$, not $180^\\circ$. Multiplying $180^\\circ$ by $\\frac{\\pi}{180^\\circ}$ gives the correct answer, $\\pi$."},{"text":"$$2\\pi$","correct":false,"explanation":"This represents a full turn of $360^\\circ$, rather than the half-turn requested. The radian equivalent of $180^\\circ$ is $\\pi$."},{"text":"$$\\frac{\\pi}{180}$","correct":false,"explanation":"This confuses the conversion factor with the converted angle. Multiplying $180^\\circ$ by $\\frac{\\pi}{180^\\circ}$ gives $\\pi$ radians."}]},{"id":"4ad55765-9302-4b09-b7a5-2f805d47a7c8","cardType":"basic","points":1,"front":"Define $\\sec x$ in terms of the primary trigonometric functions.","back":"$$\\frac{1}{\\cos x}$","mcqOptions":[{"text":"$$\\frac{1}{\\cos x}$","correct":true,"explanation":"Secant is defined as the reciprocal of cosine. Therefore, wherever $\\cos x\\ne 0$, $\\sec x=\\frac{1}{\\cos x}$."},{"text":"$$\\frac{1}{\\sin x}$","correct":false,"explanation":"This is the definition of cosecant, not secant. Secant is the reciprocal of cosine, so $\\sec x=\\frac{1}{\\cos x}$."},{"text":"$$\\frac{1}{\\tan x}$","correct":false,"explanation":"This is the definition of cotangent, not secant. Secant uses only the reciprocal of cosine: $\\sec x=\\frac{1}{\\cos x}$."},{"text":"$$\\frac{\\sin x}{\\cos x}$","correct":false,"explanation":"This is equivalent to $\\tan x$, not $\\sec x$. Secant is obtained by taking the reciprocal of cosine, giving $\\frac{1}{\\cos x}$."}]},{"id":"4acad466-d7ca-4026-9b22-737a08386fd7","cardType":"basic","points":1,"front":"Define $\\csc x$ in terms of the primary trigonometric functions.","back":"$$\\frac{1}{\\sin x}$","mcqOptions":[{"text":"$$\\frac{1}{\\sin x}$","correct":true,"explanation":"Cosecant is defined as the reciprocal of sine. Therefore, wherever $\\sin x\\ne 0$, $\\csc x=\\frac{1}{\\sin x}$."},{"text":"$$\\frac{1}{\\cos x}$","correct":false,"explanation":"This is the definition of secant, not cosecant. Cosecant is the reciprocal of sine, so $\\csc x=\\frac{1}{\\sin x}$."},{"text":"$$\\frac{1}{\\tan x}$","correct":false,"explanation":"This is the definition of cotangent, not cosecant. Cosecant uses the reciprocal of sine: $\\csc x=\\frac{1}{\\sin x}$."},{"text":"$$\\frac{\\sin x}{\\cos x}$","correct":false,"explanation":"This is equivalent to $\\tan x$, not $\\csc x$. Cosecant is formed by taking the reciprocal of sine, giving $\\frac{1}{\\sin x}$."}]},{"id":"fdac8593-f66f-4817-9091-2a5de2bc2a2b","cardType":"basic","points":2,"front":"State the two ways to express $\\cot x$ in terms of $\\sin, \\cos,$ or $\\tan$.","back":"

$\\frac{1}{\\tan x}$
$\\frac{\\cos x}{\\sin x}$

","mcqOptions":[{"text":"

$\\frac{1}{\\tan x}$
$\\frac{\\cos x}{\\sin x}$

","correct":true,"explanation":"Cotangent is the reciprocal of tangent. Since $\\tan x=\\frac{\\sin x}{\\cos x}$, taking its reciprocal also gives $\\cot x=\\frac{\\cos x}{\\sin x}$."},{"text":"

$\\tan x$
$\\frac{\\sin x}{\\cos x}$

","correct":false,"explanation":"Both expressions shown are forms of tangent, not cotangent. Cotangent reverses these ratios, giving $\\frac{1}{\\tan x}$ and $\\frac{\\cos x}{\\sin x}$."},{"text":"

$\\frac{1}{\\tan x}$
$\\frac{\\sin x}{\\cos x}$

","correct":false,"explanation":"The first expression is cotangent, but the second is tangent. The equivalent ratio must also be reciprocal, so it is $\\frac{\\cos x}{\\sin x}$."},{"text":"

$\\frac{1}{\\cos x}$
$\\frac{\\cos x}{\\sin x}$

","correct":false,"explanation":"The second expression is cotangent, but the first is secant rather than cotangent. The required reciprocal expression is $\\frac{1}{\\tan x}$."}]}]}],"examCountdown":{"examDate":"2027-05-26","paperLabel":"Paper 1"},"heading":"Trigonometric Functions","title":"Trigonometric Functions Flashcards","topbar":{"backHref":"/a-level/maths/edexcel/flashcards"},"topicSidebar":"$L38"}]}],"topicId":"59faadfc-37a1-4828-ad12-9f88ffc62f99","walled":"$L39"}],"$L3a","$L3b"]