Question

Could anybody plz solve 4 and 5

Answer 1

Answer:

5th problem answer is 5/4

Step-by-step explanation:

because the sin ratio is opp/hyp, so the cosec is opposite to sin. sin opp/hyp=4/5 so the value of cosec is 5/4.

Answer 2

Answer:

4. 1

5. 5/4

Step-by-step explanation:

4.

sin² 20 = 1 - cos² 20 ... (Trigonometric identity, sin² x + cos² x = 1)

= 1 - cos² (90-70)

= 1 - sin² 70 .... cos (90- x) = sin x

Thus, sin² 20 + sin² 70 = 1

5. 5sin ∅ = 4

So, sin ∅ = 4/5

cosec ∅ is the reciprocal of sin ∅

So, cosec ∅ = 1/sin ∅ = 1/(4/5) = 5/4

Hope that solves it

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