Question

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Answer 1

Answer:

4 (c)

5.1+cot² theta = cos²theta

= sin² theta . 1/tan² theta

=1/2 sin² theta .sin ² theta

= 1

Answer 2

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1. sec(90°)=1cos(90°)=10 which cannot be calculated. You can get "near" 90° from the left or the right using, say, the limit. You'll find that near 90° the sec tends to ∞.