69. Evaluate ( a + 1) 2 - 5 when a = -3

Step-by-step explanation:

( a + 1) 2 - 5

(Putting value of a = -3)

=> (-3 + 1) 2 - 5

=> -2 × 2 - 5

=> -4 - 5

=> - 9 (Ans)

hope it you

step-by-step explanation:

sin(7pi/6 - pi/3)  

= sin(7pi/6 - 2pi/6)  

= sin(5pi/6)  

= sin(pi - pi/6)  

= sin(pi/6)  

= 1/2  

sin 7pi/6 - sin pi/3  

= sin (pi + pi/6) - sin pi/3  

= -sin pi/6 - sin pi/3  

= -1/2 - sqrt(3)/2  

= -(1+sqrt(3))2

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step-by-step explanation: