====== Question 10, Exercise 9.1 ======
Solutions of Question 10 of Exercise 9.1 of Unit 09: Trigonometric Functions. This is unit of Model Textbook of Mathematics for Class XI published by National Book Foundation (NBF) as Federal Textbook Board, Islamabad, Pakistan. 


=====Question 10=====
Alternating current cyclically reverses direction. The maximum voltage is about 180 volts when the standard frequency is 56 Hz ( 56 cycles per second). The voltage can be modeled by $ V(t)=a \operatorname{Sin}(k(t-d))+c$\\
Determine each of the following:\\
a. Period of $56 \mathrm{~Hz} A C$,\\
b. The value of $k$,\\
c. The amplitude of the voltage function,\\
d. Model the voltage with an appropriate transformed Sine function.

** Solution. **




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