What is the general solution for -cos(t)=cos(t) ?

The general solution for -cos(t)=cos(t) is t= pi/2+2pin,t=(3pi)/2+2pin

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-cos(t)=cos(t)

- cos (t) = cos (t)

t = \frac{π}{2} + 2 πn, t = \frac{3 π}{2} + 2 πn

Solution steps

- cos (t) = cos (t)

Solve by substitution

cos (t) = 0

cos (t) = 0 : t = \frac{π}{2} + 2 πn, t = \frac{3 π}{2} + 2 πn

Combine all the solutions

t = \frac{π}{2} + 2 πn, t = \frac{3 π}{2} + 2 πn

sin^{2} (x) - cos (2 x) = - \frac{1}{4}

2 = cos^{2} (x) + sin^{2} (x)

- 5 π sin (\frac{π ( t )}{2}) = 7.071

9.8 \cdot sin (x) - 19.6 \cdot cos (x) = 4.7

cos (x) = - 3 sin (x)

What is the general solution for -cos(t)=cos(t) ?
The general solution for -cos(t)=cos(t) is t= pi/2+2pin,t=(3pi)/2+2pin