6. Trigonometric Identities and More Equations
Solving Trigonometric Equations Using Identities
Multiple Choice
Multiple ChoiceFind all solutions to the equation.
(cosθ+sinθ)(cosθ−sinθ)=−21
A
θ=125π+2πn,127π+2πn
B
θ=32π+2πn,34π+2πn
C
θ=3π+2πn,32π+2πn
D
θ=3π+πn,32π+πn
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