Step {{ step }} of {{ totalSteps }}
Combine angles
Find two standard angles that add or subtract to make {{ s1.targetAngle }}°.
{{ s1.slots[0] }}°
{{ s1.slots[1] }}°
=
{{ s1.targetAngle }}°
Build the formula
Drag the terms to complete the {{ s2.formulaName }} formula.
{{ s2.sign }}
Slide to merge
Discover the double-angle formula by setting equal to .
Tap to simplify
Apply identities to simplify the expression.
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Mastered!
You've successfully built, merged, and simplified complex trigonometric identities.