Half-Angle Formulae
If ABC is a triangle with sides a = BC, b = CA, c = AB, then prove that where 2s = a + b + ..
If ABC is a triangle with sides a = BC, b = CA, c = AB, then prove that where 2s = a + b + ..Find the value of tan 360° using triple-angle formula.
Find the value of tan 360° using triple-angle formula. => - 1 or 3 or 0 or 1..
Find the value of sin 90°, using the double-angle formula.
Find the value of sin 90°, using the double-angle formula. => 1 or 2 2 or -1 or 0..
Find the value of cos 270° using triple-angle formula.
Find the value of cos 270° using triple-angle formula. => 2 or 1 2 or 1 or 0..
Find the value of sin 135° using triple-angle formula.
Find the value of sin 135° using triple-angle formula. => 1 or 0 or - 1 or 1 2..
Find the value of sin 180° using triple-angle formula.
Find the value of sin 180° using triple-angle formula. => 1 2 or - 1 or 0 or 1..
Find the value of tan 180° using triple-angle formula.
Find the value of tan 180° using triple-angle formula. => 1 3 or 0 or - 1 or 1..
Find the exact value of tan 150° using half-angle formula.
Find the exact value of tan 150° using half-angle formula. => - 3 3 or 3 3 or 3 or - 3..
Use the double angle formula to find the value of tan 120°.
Use the double angle formula to find the value of tan 120°. => - 3 3 or - 3 or 3 3 or 3..
Use half-angle formula to find the value of tan 15°.
Use half-angle formula to find the value of tan 15°. => 2 - 3 or 2 + 3 or 2 3 3 or 3 6..
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