Question

plz solve at least one question between 4 to 8
find the value of cos a-sin a and tan a +cot a​

Answer 1

Step-by-step explanation:

4. π/3 = 60°

Cos 60 - Sin 60 = 1-√3 / 2

Tan 60 + Cot 60 = 4 / √3

5. 2π / 3 = 120°

Cos 120 + Sin 120 = - cos 60 + Sin 60

= √3-1/2

Tan 120 + Cot 120 = - Tan 60 - Cot 60

= - 4/√3

6.5π/4 = 225°

cos 225 + Sin 225 = - Cos 45 - Sin 45

= -2/√2 = -√2

Tan 225 + Cot 225 = Tan 45 + Cot45 = 2

7.7π/4= 315°

Cos 315 + Sin 315 = Cos 45 - Sin 45 = 0

Tan 315 + Cot 315 = - Tan 45 - Cot45 = -2

8. 11π/3 = 495° = 360 + 135

Cos 495 + Sin 495 = cos 135 + Sin 135

= Sin 45 - Cos 45 = 0

Tan 495 + Cot 495 = Tan 135 + Cot135

= - Tan 45 - Cot 45

= -2