Question

please solve it
I didn't understand it





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Answer 1

Answer:

Step-by-step explanation:

in ΔABC, ∠B = 90°

We can say that ∠C= 90 - ∠A

a) sinA * cosC

= sin A * cos (90 - A)

= sin A * sin A

= sin ²A

b) tan A / cot A

= tan A * (1/tan A)

= 1

c) 1 + tan ²A = sec ²A