Answer:
cos(−a)= 0.7
sin(−a)= -0.7
Explanation:
Given the follwoing
cos(a)=0.7 and sin(a)=0.7 where a is within the interval 0
cos(-a) = cos a
sin(-a) = -sina
Substitute the given value in the expression;
Since cos a = 0.7
cos(-a) = 0.7
Also since sin a = 0.7
sin(-a) = -0.7
