Question

if a + b is equal to 90 degree b + C is equal to a then prove that cos C is equal to tan2b​

Answer 1

Answer:

Step-by-step explanation:

a+b=90

>a=90-b

b+c=a

>b+c=90-b

>c=90-2b

cos C = cos (90-2b)

         =sin 2b

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