What are the basic trigonometric identities?
Mathematics
ScanSolve AI Answer
The fundamental trig identities: sin²θ + cos²θ = 1 (Pythagorean), tan θ = sin θ/cos θ, 1 + tan²θ = sec²θ, 1 + cot²θ = csc²θ. Double angle: sin 2θ = 2 sin θ cos θ, cos 2θ = cos²θ - sin²θ. Sum: sin(A+B) = sinA cosB + cosA sinB. These are essential for simplifying expressions and solving trig equations. Memorize the Pythagorean identity — everything else derives from it.
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