10.3 Double Angle and Half Angle Formulas
Double Angle for Sine
Double Angle for Cosine
Double Angle for Tangent
If Find:
Find a formula for sin4x
Half Angle Formula for Sine Start with a double angle formula Notice that the contents of the parentheses on the left is twice that of the parentheses on the right. Rewrite the equation, keeping this fact true.
Half Angle Formula for Cosine Start with another double angle formula Notice that the contents of the parentheses on the left is twice that of the parentheses on the right. Rewrite the equation, keeping this fact true.
Find the exact value of cos (5/8) Why is this negative?
Find the exact value of sin (/12)
Half Angle Formula for Tangent
Half Angle Formula for Tangent If you rationalize the denominator: Multiply by the conjugate
Half Angle Formula for Tangent If you rationalize the numerator: Multiply by the conjugate
Simplify the expression:
Find the values of sin(2x), cos(2x) & tan(2x) using the given information Angle x is obtuse and
Find the values of sin(2x), cos(2x) & tan(2x) using the given information Angle x is acute and