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u = 2 x + 1, d u = 2 d x, d x = d u / 2
- 9 / ( 2 + 1 )² - ( - 9 / ( 0 + 1 )² =
- 9 / 9 + 9 = - 1 + 9 = 8
Answer:
Step-by-step explanation:
using the 30- 60- 90 triangle for exact values , then
tan60° = , and
cot60° = =
cos60° =
cot60° cos60°
= ×
= ← rationalise the denominator by multiplying by
= ×
=