Question

cos (90°-A) sin(90°-A) / tan(90°-A)= 1- cos^2A​

Answer 1

Answer:

Step-by-step explanation:

cos (90-A)= sin A

sin(90-A)=cos A

tan(90-A)= cot A

SO,

cos A. sin A/cot A=

cos A. sin A * sin A/cos A

Then the cos A in the numerator will be canceled with the cos A in the numerator...

=sin^2 A

=1- cos^2 A

hence, proved

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