Trigonometry Questions (Multiple Choice) More Than 1 Answer Can Be Correct

Question

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726

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Select all true statements.

The double-angle identity for cos2A = 2cos²A - 1.

The double angle identity for sin2A = 2cos²A.

The double-angle identity for cos2A = 1 - 2sin²A.

Double-angle identities may be derived from angle sum identities, using (A + A) instead of (A + B) for the angle sum.

Guest Oct 20, 2014

+128707

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Best Answer

All are true except this one:

"The double angle identity for sin2A = 2cos²A."

(Sin2A = 2sinAcosA)

CPhill Oct 20, 2014

CPhill · Answer 1 · 2014-10-20T04:45:58

All are true except this one:

"The double angle identity for sin2A = 2cos²A."

(Sin2A = 2sinAcosA)