```
test_that("trigonometric functions match identities", {
expect_equal(sin(pi / 4), 1 / sqrt(2))
expect_equal(cos(pi / 4), 1 / sqrt(2))
expect_equal(tan(pi / 4), 1)
})
if (FALSE) {
test_that("trigonometric functions match identities", {
expect_equal(sin(pi / 4), 1)
})
}
```

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