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Sin(90-a).sin a + cos(90- a).cos a
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Tan a cot a
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sin2a or 2sina.cosa
Step-by-step explanation:
sin(90-a).sina+cos(90-a).cosa/tana.cota
by formula
cos(a-b)=Cosa.Cosb+Sina.Sinb
cos(90-a-a)/tana.cota
sin2a/tana.cota
(sin2a)cosa.sina/sina.cosa
sin2a or 2sina.cosa
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