Question

solve sin ^ 20 + sin^ 70 - tan ^ 45

Answer 1

sin²20+sin²70-tan45
=sin²20+cos²20-tan²45
=1-tan²45
=1-1=0

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Answer 2

Step-by-step explanation:

sin²20+sin²70-tan²45

sin²20+sin²(90-20)-tan²45 [by applying formula]

sin²20+cos²20-tan²45

1-tan²45 [value of tan45 is 1]

1-(1)²

1-1

0

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