1.
sin55 = cos35 = 0.8192
sin(55) = cos( )
Since sin and cos are complementary,
sinθ = cos(90 - θ)
Since θ = 55
sin55 = cos(90 - 55)
sin55 = cos35
So, sin55 = cos35 = 0.8192
2.
sin62 = cos28 = 0.8829
sin() = cos(28 )
Since sin and cos are complementary,
sin(90 - θ) = cosθ
Since θ = 28
sin(90 - 28) = cos28
sin62 = cos28
So, sin62 = cos28 = 0.8829
3.
cos0 = sin90 = 1
cos(y) = sin(-)
Since sin and cos are complementary,
cosy = sin(90 - y)
Since y = 0
cos0 = sin(90 - 0)
cos0 = sin90 = 1
So, cos0 = sin90 = 1
Learn more about comlementary angles here:
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