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If cos(a + B) = 0, then sin(a - B) can be reduced to ?
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If cos(a + B) = 0, then sin(a - B) can be reduced to ?
Cos(α + β) = 0
⇒ cos(α + β) = cos90(∵ cos0 = 0)
⇒ α + β = 90
⇒ α = 90 − β
sin(α − β)
= sin(90 − 2β) = cos2β   (∵ sin(90 − θ) = cosθ)
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If cos(a + B) = 0, then sin(a - B) can be reduced to ?
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