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Prove That: Sin²A - Sin²B + Sin²C = -2sinA.cosB.sinC | Trigonometry Solutions
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Prove That: Sin²A - Sin²B + Sin²C = -2sinA.cosB.sinC | Trigonometry Solutions
Prove That: Sin²A + Sin²B - Sin²C = 2sinA.sinB.cosC | Trigonometry Made Easy
3:23
Prove That: Sin²A + Sin²B - Sin²C = 2sinA.sinB.cosC | Trigonometry Made Easy
Prove That : 〖Sin〗^2 A-〖Sin〗^2 B-〖Sin〗^2 C=-2cosA.sinB.sinC
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Prove That : 〖Sin〗^2 A-〖Sin〗^2 B-〖Sin〗^2 C=-2cosA.sinB.sinC
Prove That : cosA-cosB-cosC=1-4sin A/2.cos B/2.cos C/2
4:49
Prove That : cosA-cosB-cosC=1-4sin A/2.cos B/2.cos C/2
Prove That: cosA-cosB+cosC=4cos A/2.sin B/2.cos C/2-1
4:05
Prove That: cosA-cosB+cosC=4cos A/2.sin B/2.cos C/2-1
Prove That : Cos(A-B).Cos(A+B)= 〖Cos〗^2 A-〖Sin〗^2 B
2:47
Prove That : Cos(A-B).Cos(A+B)= 〖Cos〗^2 A-〖Sin〗^2 B
Prove That : -sinA+sinB+sinC=4cos A/2.sin B/2.sin C/2
3:52
Prove That : -sinA+sinB+sinC=4cos A/2.sin B/2.sin C/2
Prove That : sinA-sinB-sinC=-4cos A/2.sin B/2.sin C/2
5:51
Prove That : sinA-sinB-sinC=-4cos A/2.sin B/2.sin C/2
Prove that: sinA+sinB-sinC=4sin A/2.sin B/2.cos C/2
3:52
Prove that: sinA+sinB-sinC=4sin A/2.sin B/2.cos C/2
Prove that: sinA-sinB+sinC=4sin A/2.cos B/2.sin C/2
5:45
Prove that: sinA-sinB+sinC=4sin A/2.cos B/2.sin C/2
Prove that: Sin2A + Sin2B - Sin2C = 4CosA.CosB.SinC
7:24
Prove that: Sin2A + Sin2B - Sin2C = 4CosA.CosB.SinC
Simplify: (tanA + cotA) ^ 2 - (sinA + cosecA) ^ 2 - (cosA + secA) ^ 2
2:58
Simplify: (tanA + cotA) ^ 2 - (sinA + cosecA) ^ 2 - (cosA + secA) ^ 2
Prove that: (sin(Pi/8 + A/2))^2 - (sin(Pi/8 - A/2))^2 =(1/root(2))sinA
2:34
Prove that: (sin(Pi/8 + A/2))^2 - (sin(Pi/8 - A/2))^2 =(1/root(2))sinA
Prove that: tan20 . tan40 . tan80 = root(3)
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Prove that: tan20 . tan40 . tan80 = root(3)
Prove that: (sinA)^2 + (sin(A + 120))^2 (sin(A - 120))^2 = 3/2
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Prove that: (sinA)^2 + (sin(A + 120))^2 (sin(A - 120))^2 = 3/2
Prove that: (cosB - cosA)^2 + (sinA - sinB)^2 = 4(sin((A - B)/2))^2
3:38
Prove that: (cosB - cosA)^2 + (sinA - sinB)^2 = 4(sin((A - B)/2))^2
Prove that: (cosA + cosB)^2 + (sinA + sinB)^2 = 4(cos((A - B)/2))^2
3:09
Prove that: (cosA + cosB)^2 + (sinA + sinB)^2 = 4(cos((A - B)/2))^2
Prove that: cos(36 - A) . cos(36 + A) + cos(54 + A) . cos(54 - A) = cos2A
2:58
Prove that: cos(36 - A) . cos(36 + A) + cos(54 + A) . cos(54 - A) = cos2A
Prove that: sinA . sin(60 - A) . sin(60 + A) = (1/4)sin3A
2:21
Prove that: sinA . sin(60 - A) . sin(60 + A) = (1/4)sin3A
Prove that: cosA . cos(60 - A) . cos(60 + A) = (1/4)cos3A
3:05
Prove that: cosA . cos(60 - A) . cos(60 + A) = (1/4)cos3A
Prove that: cos(45 + A) . cos(45 - A) = (1/2)cos2A
1:22
Prove that: cos(45 + A) . cos(45 - A) = (1/2)cos2A
Prove that: sin(45 + A) . sin(45 - A) = (1/2)cos2A
1:53
Prove that: sin(45 + A) . sin(45 - A) = (1/2)cos2A
Prove that: cos20 . cos40 . cos60 . cos80 = 1/16
3:48
Prove that: cos20 . cos40 . cos60 . cos80 = 1/16
Prove that: cos40 . cos100 . cos160 = 1/8
4:10
Prove that: cos40 . cos100 . cos160 = 1/8
Prove that: (sin4A + sin2A)(cos4A - cos8A)/(sin7A + sin5A)(cosA - cos5A) = 1
4:43
Prove that: (sin4A + sin2A)(cos4A - cos8A)/(sin7A + sin5A)(cosA - cos5A) = 1
Prove that: (sin(P + 2)A - sinPA)/(cosPA - cos(P + 2)A )= cot(P + 1)A
3:32
Prove that: (sin(P + 2)A - sinPA)/(cosPA - cos(P + 2)A )= cot(P + 1)A
Prove that: (cos2A . cos3A + cos2A . cos7A)/ (sin4A . sin3A + sin2A . sin5A) = (sin7A + sin3A)/sinA
10:15
Prove that: (cos2A . cos3A + cos2A . cos7A)/ (sin4A . sin3A + sin2A . sin5A) = (sin7A + sin3A)/sinA
Prove that: (cos7A + cos3A - cos5A - cosA)/(sin7A - sin3A - sin5A + sinA) = cot2A
9:38
Prove that: (cos7A + cos3A - cos5A - cosA)/(sin7A - sin3A - sin5A + sinA) = cot2A
Prove that: (sinA . sin2A + sin3A . sin6A)/ (sinA . cos2A + sin3A . cos6A) = tan5A
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Prove that: (sinA . sin2A + sin3A . sin6A)/ (sinA . cos2A + sin3A . cos6A) = tan5A
Prove that: sin10 . sin30 . sin50 . sin70 = 1/16
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Prove that: sin10 . sin30 . sin50 . sin70 = 1/16