I try to execute the equation
written
To solve[9.897527129 ==
9.780327 (1 + 0.0053024 (Sin[x]) ^ 2 - 0.0000058 Sin[2 x]) && -90 <=
x <= 90, x, reals]
I actually press Shift + Enter and nothing happens. Can you find out what is wrong?
Thank you in advance for your answer