Question

without using trigonometric table find: sin^2(20)+sin^2(70)-tan^2(45)​

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

0

Step-by-step explanation:

sin²(20) = sin²(90-70) = cos²70

put sin²20 = cos²70

=cos²70 + sin²70 - tan²45

=1 - 1

=0